The membrane of a neuron contains many more __K+__ leak channels than ____Na+___ leak channels, and this causes the resting membrane potential to be somewhat near to the equilibrium potential for __-70mV___.
What is leak channel ?
Ion channels that are non-gated are always open. These channels are also known as "leak" channels since they do not impose any resistance on the ions as they move through them.
The simplest ion channel type is a leakage channel since its permeability is essentially constant. Potassium and chloride channels are the leaky channel types that are most important in neurons.
In order to generate electrical impulses in neurons, potassium (K(+)) channels, which are membrane proteins, allow rapid and selective flow of K(+) ions across the cell membrane. K(+) channels are therefore essential for controlling neuronal excitability.
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If DNA is damaged or incompletely replicated in S phase, what molecule’s inhibition prevents the cell from entering M phase? A. Cdc6
B. Cdc25
C. S-Cdk
D. ORC
The Cdc25 molecule's inhibition prevents the cell from entering M phase if DNA is damaged or incompletely duplicated during S phase. The answer is (b).
In mammalian cells, CDC25C is predominately a nuclear protein. It is crucial in the control of cell division. It causes the entry into mitosis by dephosphorylating the Thr14 and Tyr15 residue of cyclinB-bound CDC2. Additionally, it is thought to prevent p53-induced growth arrest. Recent research has shown the dual phosphatase CDC25 as a potential target for a variety of triple-negative breast cancers, including those with RB1/PTEN/P53-deficient tumors.
Additionally, PI3K inhibitors and CDC25 inhibitors work well together to limit the growth of tumors. One of the most important cell cycle regulators is cell division cycle 25 A (Cdc25A), a dual-specificity protein phosphatase that dephosphorylates inhibitory cyclin-dependent kinases (CDKs) like CDK2, CDK4, and CDK6 and positively controls the activities of CDKs that promote cell cycle advancement.
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amount of prognathism canine shearing complex is it present? absent? what is the shape/size of the canine? is there a diastema? height of skull. how much skull is above the supraorbital ridge? saggital crest? shape of the facial profile. (scoop out, flat, etc) what is the shape of the chin area? does it recede? is it vertical? does it protrude? size of the braincase? smaller or larger? relative to the face. much or little postorbital constriction? what is the position of the foramen magnum? center, more toward posterior of the skull?
Skeletal alterations for bipedal movement. Similar to incisors are canines.
Canines obstruct apically, hence they can only be worn apically. not a diastema. Bicuspid lower anterior premolars.
Who of the primates has the biggest canine?Originally from west-central Africa, the mandrill (Mandrillus sphinx) is a sizable Old World monkey. With skin that is red and blue on its face and back, it is one of the most colorful creatures in the entire animal kingdom. The species exhibits sexual dimorphism, with the males having a larger physique, longer canines, and more vibrant coloring.
Why do human dogs have small canines?Because they had smaller canines, early humans may not have engaged in as much physical combat to compete for females as other apes. However, this is only one explanation for why we have short canines.
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an algal bloom is an event that occurs when the level of nutrients in an aquatic ecosystem rises. higher nutrient levels increase the ecosystems carrying capacity for algae, and the algae population multiplies dramatically. describe how an algal bloom might alter the local carbon cycle in that ecosystem.
Algae bloom grows, it gets rid of carbon dioxide from the environment through changing it to biomass and oxygen thru photosynthesis.
Algae convert carbon dioxide to biomass at particularly rapid rates. Great blooms of oceanic algae, referred to as phytoplankton, take carbon out of the environment for the duration of photosynthesis, a good deal of that's then taken deep into ocean with them after they die.
A fast growth in algal bloom on floor of water results in greater uptake of carbon dioxide from environment for photosynthesis and launch of greater quantity of oxygen to the environment.
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The follicular phase of the ovaries corresponds to the ________ phase of the endometrium.
The follicular phase of the ovaries corresponds to the menstrual and proliferative phase of the endometrium.
The organs within the lady's reproductive device consist of the uterus, ovaries, fallopian tubes, cervix, and vagina. The uterus has a muscular outer layer known as the myometrium and an internal lining called the endometrium.
The physiological features of the uterine endometrium (uterine lining) are guidance for implantation, renovation of being pregnant if implantation happens, and menstruation in the absence of pregnancy. The endometrium, therefore, performs a pivotal role in the replica and continuation of our species.
Endometrial hyperplasia most often is caused by extra estrogen without progesterone. If ovulation does not occur, progesterone is not made, and the liner isn't shed.
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what is the shannon index h' for a community that consists of only two species, which both have exactly the same number of individuals
the shannon index h' for a community that consists of only two species, which both have exactly the same number of individuals is one
A technique to gauge the species diversity in a community is to use the Shannon Diversity Index, also known as the Shannon-Wiener Index.
This index, designated as H, is figured out as follows:
H = -Σpi * ln (pi)
where:
Greek letter, which stands for "sum"
Natural log pi is defined as the percentage of species I that make up the total community. The variety of species in a given community is inversely correlated with H value. The variety decreases with decreasing H values. A community with a H value of 0 has a single species. An indicator of how evenly distributed the species are in a community is the Shannon Equitability Index.
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Multigene families include two or more nearly identical genes or genes sharing nearly identical sequences. a classical example is the set of genes for globin molecules, including genes on human chromosomes 11 and 16. How might identical and obviously duplicated gene sequences have gotten from one chromosome to another?
Chromosome translocation has caused the transfer of identical and clearly duplicated gene sequences from one chromosome to another.
What exactly are human genes?The fundamental structural and operational unit of heredity is the gene. DNA makes up genes. Some genes serve as instructions for creating molecules known as proteins. Many genes do not, however, encode proteins. Genes in humans can range in size form a few hundred Nucleotide bases to more about 2 million bases.
What kinds of genes are examples?Many of your characteristics, like your skin tone and hair color, are determined by genes that are handed down to you. Maybe Emma's mother had one trait for brown hair and another one for red hair, and she gave Emma the red hair gene.
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at which stage of the general adaptation syndrome does the body attempts to repair any damage and return to a condition of stability and equilibrium?
The stage of the body trying to repair the damage and return to balance is the resistance stage.
The general adaptation syndrome is a pattern of body mechanisms that are activated in response to an ongoing threat to almost any stressor. When experiencing stress, the heart rate will increase and the adrenal glands will release the hormone cortisol.
In the resistance stage, ongoing stressor exposure is compatible with adaptation. The body that is experiencing stress will repair itself by reducing the release of the hormone cortisol to lower, heart rate and blood pressure begin to normal. The body enters the recovery phase. When stress is resolved, the body will adapt to high stress levels, the body undergoes changes to deal with the stress.
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What is the enzyme that is added as the helix unwinds into short segments of RNA?
Answer: DNA Helicase is the enzyme that is added as the helix unwinds or ''unzips'' Into short segments of RNA.
Explanation: I really hope this helps out. PLEASE MARK BRAINLEST
the follicular phase of the ovaries corresponds to the ________ phase of the endometrium.
The menstrual and proliferative phases of the endometrium are matched by the follicular phase of the ovaries.
the follicular phase, what is it?Beginning on the first day of your menstruation and lasting 13 to 14 days, the follicular phase culminates in ovulation. To promote the development of follicles on the surface of an ovary, the pituitary gland in the brain produces a hormone. Only one follicle will typically develop into an egg.
Which uterine phase does the ovaries' follicular phase correlate to?Ovarian follicles mature throughout the follicular phase of the female menstrual cycle, preparing one of them for release during ovulation. Concurrent alterations occur in the endometrium during this time.
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which mass extinction event occurred just before the rapid increase in speciation among mammalian species?
An extinction event is a significant and rapid loss of the biodiversity of the planet. It happens when a large number of species perish suddenly, as the dinosaurs.
Why is it referred to as a mammal?Mammals are distinguished from other vertebrate animals by a number of distinguishing traits. All species of mammals produce and secrete milk from their mammary glands to feed their young. Even though the amount of hair differs amongst various mammalian species, they also have hair on their bodies.
The human being: a mammal?Mammals are all warm-blooded, hair-covered vertebrates, including people. They provide milk for their young and have a brain that is more developed than those of other mammal species.
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problem in spindle fiber, which step of the cell cycle will it arrest. and what will be the cell response?
The spindle fiber problem will arrest the cell at the metaphase step of the cell cycle. The cell response to this arrest will be to activate the spindle assembly checkpoint, which will halt the progression of the cell cycle until the spindle fiber problem is resolved.
The cell cycle will be arrested in the G2 phase. The cell will respond by activating the spindle assembly checkpoint, which will halt the cell cycle until the spindle fiber is repaired or replaced. This checkpoint is designed to ensure that the cell divides properly and accurately, so if the spindle fiber is compromised, the checkpoint will delay the cell cycle until it has been fixed.
The cell response will be an increase in cell size and an accumulation of mitotic proteins and enzymatic activities. This is because the spindle fiber problem prevents the chromosomes from separating and thus prevents the cell from entering the next step in the cell cycle. As a result, the cell will remain in metaphase and will continue to grow and accumulate mitotic proteins and enzymes.
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describe the mechanism of evolution that lead to the appearance of aerobic respiration within the eukaryotes and the evidence that we have for that mechanism.
The conversion of fuel, such as fats and sugars, into chemical energy is known as aerobic respiration. Anaerobic respiration, in contrast, doesn't require oxygen. All cells use respiration to convert fuel into energy that can drive cellular functions.
A chemical reaction that converts carbohydrates into energy using oxygen (sugars). also known as oxidative metabolism, aerobic metabolism, and cell respiration. During aerobic cellular respiration, glucose and oxygen combine to create ATP, which the cell can utilise. As byproducts, carbon dioxide and water are produced. For aerobic cellular respiration, the general equation is: During cellular respiration, the reaction between glucose and oxygen produces ATP. All cellular activities are powered by energy produced by aerobic respiration. The processes result in the production of ATP, which is subsequently utilized to power other life-sustaining processes like growth, repair, and maintenance. While the majority of anaerobic (without oxygen) and aerobic (with oxygen) respiration respectively occurs in the cytoplasm and mitochondria of the cell, respectively.
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what environmental parameters would need to be monitored as ddt moves up the food web of an ecosystem?
The environmental factors that need to be monitored when DDT goes up an ecosystem's food chain include air and water quality, soil fertility, and concentrations of other harmful contaminants.
How does DDT progress across the food web?When an animal eats food that contains DDT residue, the DDT builds up in the animal's tissue through a process known as bioaccumulation.The biomagnification mechanism causes the concentration of DDT in an animal's body to increase the higher up the food chain the animal is (for example, tertiary consumers like seals).By bioaccumulating in organisms and lowering population sizes that can support higher trophic levels, DDT has an impact on the food chain.Fish eating insects poisoned with DDT is a crude illustration of the food chain.DDT tends to accumulate in animals because of its chemical makeup.To learn more about DDT progress, refer to:
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when the membrane moves, the on the spiral organ hair cells distort because they are anchored by the tectorial membrane.
When basilar membrane moves, stereocilia on the spiral organ hair cells distort because they are anchored by tectorial membrane.
What are the spiral organ?
The spiral organ is also called organ of Corti which is defined as receptor organ for hearing, located in the cochlea of ear.
The spiral organ is made up of hair cells which are sensory epithelial cells that act as sensory receptor of inner ear.
During the transport of sound from the ear drum, the movement of basilar membrane lead to change in the spiral hair cells because they are anchored by the tectorial membrane.
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Arrange the structures to show how they are organized in the human body. Place the smallest unit on top, and units of increasing size beneath it.
The structure of the body from smallest to largest, namely Molecules-Organelles-Cells-Tissues-Organs-Organ Systems.
The cell is the smallest unit of living things. There are two types of cells namely animal cells and plant cells which have different structures. Plant cells have cellulose so they have a rigid shape, while animal cells have flexible cell membranes. Inside the cell there are organelles that are composed of molecules.
Groups of cells will form a tissue. Collections of cells that make up a tissue work together to perform a specific task. Groups of tissues will form organs. So organs can also be interpreted as a group of tissues of living organisms that can perform certain functions. Groups of certain organs that come together to form an organ system. For example, in the respiratory system, there are a group of organs that work together to carry out certain functions. Organ systems work together and make up the body. So the order of the constituent bodies of living things can be arranged from smallest to largest, namely molecules-organelles-cells-tissues-organs-organ systems.
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what is the name formoleculesthat provoke a specific immune response? a) antigens b) lymphocytes c)antibodies d) lysozymes
Question
what is the name formoleculesthat provoke a specific immune response? a) antigens b) lymphocytes c)antibodies d) lysozymes
Answer: antigens are the answer
Explanation:
a color-blind man marries a woman with no family history of color-blindness. what is the likelihood that they have a color-blind daughter
They have a 50% chance of having a daughter who is colorblind.
In the case at hand, it was discovered that a colorblind guy would wed a lady with normal vision who has no family history of colorblindness. The genotype of the colorblind man is [tex]X^{c} Y[/tex]. And XX is his wife. Due to the crisscross inheritance pattern of color blindness, this couple would have carrier daughters and normal sons. That comes from a mother to a son and a father to a daughter. Daughters in this scenario are carriers but not affected because the mother is healthy. However, their daughters will have a 50% risk of having the condition and a 100% chance of carrying the gene.
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Ancient fossilized plants with a similar root structure as those living today MOST likely lived _[blank]_.
In similar environmental conditions is the correct answer.
Evolution of Plants
It is believed that plants originated from an aquatic green alga protist. They later developed vital terrestrial adaptations including vascular tissues, seeds, and flowers. Each of these significant modifications helped plants become far more successful and more suited for living on dry land.
The earliest plants were presumably akin to the aquatic algae known as stonewort. Stoneworts differ from most modern plants in that they lack roots and contain rhizoids, which resemble hairs, in place of stiff stems. Stoneworts, on the other hand, contain separate male and female reproductive systems, which is a feature of plants. Sperm must be able to swim to eggs through at least a thin film of wetness for fertilisation to take place. The first plants may have resembled stonewort in all of these respects.
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Consider the chemical reaction in equilibrium.
aA(aq) + bB(aq) Double headed arrow. cC(aq) + dD(aq)
According to Le Chatelier’s principle, which statement correctly completes the table below?
Change Effect on equilibrium constant (K)
Increase in concentration of products Value of K does not change
Increase in temperature Value of K also changes
Increase in pressure
?
value of K does not change
value of K increases
value of K decreases
value of K oscillates
"The value of the equilibrium constant (K) does not change" the statement completes the table. Hence, option A is correct.
What is chemical equilibrium?Chemical equilibrium is the condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs. When opposing reactions are happening at the same pace, chemical equilibrium happens. Since both the forward and reverse processes are engaged while the system is in an equilibrium state, the equation is shown with two arrows.
The equilibrium will move to the side of the reaction where there are fewer moles of gas as pressure rises. When the pressure is dropped, the equilibrium will shift to the side of the process where there are more gas molecules.
Hence, option A is correct.
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Answer:
A
Explanation:
edge 2023
which of these mutations will have an effect on the protein produced by the gene in which the mutation occurs? select all that apply.
Missense mutations will have an effect on the protein produced by the gene.
A missense mutation is a DNA alteration that causes the protein produced to encode a different amino acid at a specific location. Some missense mutations change how the resulting protein functions. When a mistake is made in the DNA coding, one of the base pairs is altered; for instance, A is switched out for C. This one modification, known as a substitution, causes the DNA to now encode for a new amino acid. Missense mutations don't always result in noticeable protein alterations. A neutral, "silent," or conservative mutation is when an amino acid is switched out for one with extremely comparable chemical characteristics even if the protein may still function normally as a result.
Hence, change in the codon result alternation in the protein structure and function.
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The enzyme that is responsible for catalyzing the process of transcription is called
The enzyme that is responsible for catalyzing the process of transcription is called RNA polymerase
What is the role of RNA polymerase?
The key enzyme for gene expression, RNA polymerase (RNAP), converts DNA to RNA. With the exception of mitochondrial RNA transcription, which is done by a single-subunit RNAP, all cellular species generate RNA using highly conserved multi-subunit DNA-dependent RNAPs. One of RNAP's primary responsibilities is to regulate the quantity and type of RNA transcripts produced in response to the needs of the cell. RNAP is involved in the creation of molecules with such a broad range of tasks. The enzyme, particularly the carboxy-terminal end of one subunit, interacts with a variety of other proteins, transcription factors, and signalling molecules to control its activity.
According to the question:
When DNA is translated, RNA is created. When necessary, RNA polymerase copies a gene from DNA to mRNA during transcription. The DNA location that RNA polymerase binds to during transcription is known as the promoter. One or more sigma factor proteins attach to the RNA polymerase holoenzyme to enable it to bind to promoter DNA at the start of transcription. The two strands of the DNA helix are split apart by RNA polymerase, which also produces a transcription bubble. By severing the hydrogen bonds between the complementary DNA nucleotides, this is accomplished.
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Water has several properties that allow life on Earth to exist. Which description identifies a characteristic of water that makes water useful for living organisms?
A. water is polar, which allows it to dissolve many substances
B. water is made of one hydrogen and 2 oxygen atoms making it nonpolar
C. water is able to bond with O2 allowing water to easily exchange with the atmosphere
D. Water contains strong bonds, making it difficult to break apart into hydrogen and oxygen atoms.
A hydrogen bond is formed between the oxygen atom of one water molecule and the hydrogen atom of another water molecule. Hence, option B is correct.
What is a hydrogen bond?A hydrogen bond has an electrostatic attraction between an atom and the positive charge of a hydrogen atom covalently bound to something else.
Opposite charges attract one another. The slight positive charges on the hydrogen atoms in a water molecule attract the slight negative charges on the oxygen atoms of other water molecules. This tiny force of attraction is called a hydrogen bond.
Therefore, option B is correct.
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why do you think that symbols (originating with petroglyphs) remain a viable part of our visual vocabulary?
Petroglyphs can have hidden meanings that were only known to the people who created them. Each image's context plays a crucial role in determining its meaning.
The Petroglyphs were made for a variety of causes, the majority of which modern culture does not fully comprehend. Unlike "rock art," image writing, or imitations of the natural world, petroglyphs are more than just these things. They should not be confused with ancient Indian graffiti or with symbols used to represent words in hieroglyphics. The intricate civilizations and religious practices of the neighboring tribes are reflected in the potent cultural emblems known as petroglyphs. The monument's sacred setting, where ongoing traditional rites are held, is centered on petroglyphs. Each image's context plays a crucial role in determining its meaning. Take note of how each petroglyph is situated in relation to the horizon, the images around it, and the surrounding area. Native Americans of today have claimed that the location of each petroglyph image was neither arbitrary nor careless. Petroglyphs can have hidden meanings that were only known to the people who created them. Others serve as markers for tribes, clans, kivas, or societies. Others display who came to the area and where they went. Some are religious organizations. While some petroglyphs still have meanings relevant to today, others have meanings that are unknown but nevertheless regarded as being from "those who came before." Please think about the significance of these petroglyphs to both historical and contemporary civilizations as you view them.
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an ecologist who studies groups of populations that occur together in one area is a(n) , ecologist.
A community ecology ecologist is a scientist who focuses on communities that coexist in a single location.
Community ecology examines the structure and operation of communities, which are made up of interacting populations that share an area.A community, also known as a biocoenosis, is a collection or affiliation of populations of two or more distinct species that are present in the same geographic region at the same time. There are several applications for the word community. Examples Community ecology takes into account a wide variety of environmental interactions that evolve through time. A forest community is made up of all of the trees, the plant community, the birds, squirrels, deer, foxes, fungus, fish in a forest stream, insects, and any other local or seasonal species.
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which of the following is false: re-introduction of a top-level predator (like wolves) can: a. cause livestock losses. b. increase biodiversity. c. decrease tourism. d. affect the hydrosphere (change water flow).
The false statement about the re-introduction of a top-level predator (like wolves) is to decrease tourism.
The deliberate release of a species into the wild, from captivity, or from another environment where the creature is capable of surviving is known as species reintroduction. It is an excellent tool for preserving biodiversity around the world and reviving species.
The wolves greatly increase the tourism of Yellowstone National Park and North Carolina. This is because the reintroduction of these wolves attracts the wolves watcher and increases the economy.
The reintroduction of wolves helps to keep the population of elk, deer, and other herbivores in control. Because this helps to prevent overgrazing and loss of plant species. This also further increases the biodiversity of woody species, birds, and mammals that live there.
Wolves also impact the water flows. After reintroduction, it was observed that riverbank erosion decreased, resulting in less meandering, deeper channels, and the formation of small pools in the rivers.
Therefore, the correct option is option c.
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Check all that are true statements regarding the anatomy and structure of the sympathetic division. a. The neuron cell bodies are located in the lateral homs of their spinal cord segments. b. The preganglion sympathetic axons remain in the spinal cord for a large distance before leaving. c. The sympathetic trunk ganglia house sympathetic gangionic neuron cell bodies d. The solanchnic nerves are composed of preganglione sympathetic axons that did not synapse in a sympathetic trunk ganglion
The true statements regarding the anatomy and structure of the sympathetic division are:
The neuron cell bodies are located in the lateral horns of their spinal cord segments.The sympathetic trunk ganglia house sympathetic ganglionic neuron cell bodies.The splanchnic nerves are composed of preganglionic sympathetic axons that did not synapse in a sympathetic trunk ganglion.The nervous system is a highly complex part of an animal that coordinates its actions and sensory information by sending signals to and from various parts of its body. The nervous system detects environmental changes that affect the body and then collaborates with the endocrine system to respond.
Around 550 to 600 million years ago, wormlike organisms developed nervous tissue. It is divided into two parts in vertebrates: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS is made up of the brain and the spinal cord.
The presence of a special type of cell known as a neuron defines the nervous system at the cellular level. Neurons have unique structures that allow them to send signals to other cells quickly and precisely. They transmit these signals as electrochemical impulses traveling along thin fibers called axons, which can be directly transmitted to neighboring cells via electrical synapses or cause chemicals called neurotransmitters to be released via chemical synapses.
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Classify the following traits as specific to either cells or viruses, or shared by both.Unique to cells:Shared by cells:and viruses Unique to viruses:Answer Bank:can actively respond to environmental stimulicontain genetic material protected by a protein coatcan autonomously carry out biological processescontain genetic material capable of undergoing evolution by natural selectioncontain organelles that are bound by membranes
Specific characteristics of cells such as they can react quickly to environmental cues, are capable of performing biological activities independently, and entail organelles that are membrane-bound.
Viruses only have certain characteristics: Enclose genetic material in a protein coat. The similarities between viruses and cells: contain genetic material that can undergo natural selection-based evolution
Virion, the full virus particle, is made up of genetic material encased in a protein coat made of capsomeres and is an infectious intracellular parasite. The protoplasm, cell organelles, metabolic enzymes, and all other molecular machinery are absent from viruses. Therefore, it cannot carry out biological functions, which can evolve through natural selection. The structural and operational core of every creature is the cell.
These organelles, which are surrounded by cell membranes and include organelles like mitochondria, lysosomes, chloroplasts, and vesicles, assist the cell in carrying out biological operations. Additionally, the cells carry genetic material that can evolve through natural selection and actively react to environmental cues.
Thus, we might conclude that specific property of cells, such as their ability to respond swiftly to environmental stimuli, their ability to carry out biological processes on their own, and the presence of organelles that are membrane-bound.
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the entire complement of information contained within the dna sequences of an organism is known as the
PLEASE HELP! (WILL GIVE BRAINLIEST)
Which layer of the atmosphere is
sometimes called the "weathersphere"?
A. stratosphere
B. mesosphere
C. thermosphere
D. troposphere
Answer:
D would be your answer
Explanation:
you are working on a new medication to selectively kill cancer cells. you test the drug on a culture of normal neurons to check for any side effects. despite the presence of the drug, a normal resting membrane potential of
The normal resting membrane potential of preventing Na+-gated channels from opening
Time Course of (Fast) Inactivation.
The usual voltage-gated sodium channel opens on depolarization and closes hastily on repolarization or, extra slowly, on sustained depolarization. The latter technique is called inactivation and leaves the channel refractory for a while after repolarization.
Voltage-gated sodium channels are transmembrane proteins that open whilst the membrane ability of their area come to be depolarized, permitting the glide of sodium from the place of better concentration (generally the outside of the mobileular on the resting ability) to the location of decrease concentration (generally the indoor.
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