Answer:The cell membrane functions as a barrier that makes it possible for the cytoplasm to maintain a different composition from the material surrounding the cell. The unit membrane is freely permeable to water molecules but very impermeable to ions and charged molecules. It is permeable to small molecules in inverse proportion to their size but in direct proportion to their lipid solubility.
Explanation:
What causes the differentiation of blood stem cells into new cells with different shapes and functions?.
Transcription factors are the main method by which genes are activated or deactivated.
What controls how stem cells differentiate?Stem cells often have the ability to develop into a wide variety of cell types. It appears that transcription factors, which are proteins that control which genes are transcribed in a cell, are crucial in defining the course that specific stem cells take when they differentiate.
A cell only has to alter the genes (and consequently the proteins they will produce) that will be expressed, not the ones that will remain silent, in order for it to differentiate into its specific form and function. Transcription factors are the main method by which genes are activated or deactivated.
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1) Which of the following is a piece of biochemical evidence for all for all species that supports the theory of evolution from a common ancestor?a) aerobic respirationb) storage of DNA in the nucleic) production of the same types of proteinsd) use of the same genetic code
One biochemical evidence that supports the theory of evolution that says that we all come from a common ancestor is the fact that all organisms use the same genetic code for the translation of proteins, for example, the codon AUG codes for the amino acid methionine in all organisms.
This means D would be the right answer.
Which molecule is produced by the light-dependent reactions of photosynthesis?
NADPH
carbon dioxide
Water
Oxygen
Answer:
Oxygen
Explanation:
During the light dependent stage of Photosynthesis, water that was absorbed and transported to leaves are split apart by heat energy which was converted from the light energy from the sun that got trapped by the chlorophyll in the chloroplast.
when the water(H2O) is split apart, oxygen is given off as a by-product while the Hydrogen is later used in the light independent where it combines with CO2 from to atmosphere to make glucose.
light dependent equation:
2H2O(l) + (light energy) --> 2H2(g) + O2(g)
water --> Hydrogen + oxygen
what does a mutagen cause? view available hint(s)for part a what does a mutagen cause? a reduction in the number of trna molecules available for protein synthesis a change in the sequence of dna decreased permeability of the nuclear envelope problems with mitosis decreased enzyme activity throughout the cell
Mutagen causes a change in DNA sequence it changes the nucleotide base pairs, it may be radioactive elements acts as a mutagen.
What is mutagen?A modification to the DNA's sequence, any factor that results in a mutation (a change in the DNA of a cell).
Mutagens may injure cells and cause some illnesses, including cancer, by altering DNA nucleotide base pairs.
Therefore, radioactive elements, x-rays, UV rays, and certain compounds are examples of mutagens, and changes in DNA sequence.
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Explain why you know that diuron caused the coral to bleach.
I know that Diuron caused the coral to bleach because the coral expelled the algae that are living in their tissues.
What is Diuron?This is referred to as a herbicide which is made up of substituted urea and it is used for the control of crop and noncrop areas. Its mechanism of function is that it is able to inhibit photosynthesis which prevents plant growth.
In a situation where corals bleach, they turn white which is as a result of them expelling algae in their tissues due to different types of stressful conditions. An exposure to chemicals or a high pH may result in this condition also.
In this scenario we were told that the coral bleached however diuron inhibits photosynthesis which could have caused the expulsion of the algae which is why it was chosen.
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GIVING POINTS PLEASE HELP DUE IN 20 MINUTES
Answer:
1. Chloroplasts and cell wall
2. Plant cells are square or rectangular, while animal cells are round.
3. Absorbs sunlight to carry out photosynthesis
4. To store water
Answer:
1. Cell wall and chloroplasts
2. Plant cell have cell wall around cell membrane which determines shape of plant cell and In animal cells cell membrane is outermost structure which is semi fluid and elastic, can help to cell in changing shape
3. produce energy through photosynthesis
4. functions to hold various solutions or materials.
Explanation:
Pseudomonas bacteria colonized the bile duct of a patient following his liver transplant surgery. this is an example of a?
a. sporadic disease
b. latent infection
c. None of the answers are correct
d. communicable disease
e. nosocomial infection
Pseudomonas bacteria colonized the bile duct of a patient following his liver transplant surgery. this is an example of a nosocomial infection
Nosocomial infections is referred as healthcare-associated infections (HAI) and hospital-acquired infections because this is the infections that people acquire while receiving healthcare
The infection can occur when a pathogen spreads to a susceptible host.
Types of nosocomial infections include:
1.ventilator-associated pneumonia (VAP)
2.central line-associated bloodstream infections (CLABSI)
3.surgical site infections (SSI)
4.fungal etc.
Prevention of nosocomial infection-
1. Frequent hand hygiene
2. Usage of personal protective equipment
3. Proper sterile techniques during insertion and maintenance of devices.
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What would meiosis look like if DNA replication did not occur before meiosis 1
Answer:
Because meiosis creates cells that are destined to become gametes (or reproductive cells), this reduction in chromosome number is critical — without it, the union of two gametes during fertilization would result in offspring with twice the normal number of chromosomes!
Explanation:
3. Where do the producers get their energy from?
Answer: The Sun.
Explanation:
Producers make their own energy from sunlight.
Answer:
their energy comes from the sun.
Which of the following is an example of a glacial formation?A. methane degradationB. photosynthesisC. photolysisD. Weathering of rocks
The answer is D. Weathering of rocks.
The other options have nothing to do with glacial formation, rocks can be weathered as a result of the preassure of ice over them, eroding the underlying rock by abrasion and plucking.
Explain why pouring salt on a slug kills it, using these terms: diffusion ,osmosis, concentration gradient, hypertonic, hypotonic. (I need answers pls)
Pouring salt on a slug kills it because of the osmosis effect.
Osmosis is the phenomenon where water diffuses through a semi-permeable membrane from the region of its high concentration gradient to the region of low concentration gradient.
Salt is a chemical substance produced due to the reaction of an acid with a base. Before putting salt on the slug the condition is hypotonic i.e. less solute and more solvent. However, when salt is poured over the slug, the situation becomes hypertonic with more concentration of solute and hence that is why the slug is killed due to dehydration.
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Please help me
Thank you.
It’ll make my day
Answer:
Blood sugar regulation is an example of negative feedback, where the body works to increase the stimulus to maintain homeostasis.
Explanation:
Negative feedback loops are when someone goes out of homeostasis and the body must work harder to restore the lost balance to maintain homeostasis. Blood sugar needs to be regulated so the pancreas must release glucagon or insulin to maintain the proper levels.
1. What do enzymes do for our body?
2. How do enzymes work?
3. How are enzymes similar to puzzle pieces?
Enzymes are the biological catalysts. They are made up of proteins that have the catalytic activity. It is the result of enzymes that each reaction is accomplished within seconds inside the living organisms, which otherwise would have taken even days to finish up.
Substrate is the starting product in any chemical reaction. The enzymes acts upon the substrate, causes some changes in it and therefore forms the product.
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what process are you performing to get the newly ligated promoter and plasmids from the gga reaction into e. coli cells? explain.
We used transformation to obtain the freshly ligated promoter and plasmids.
What causes the DNA in E. coli cells to change?One of the fundamental methods in molecular biology is the heat shock method, which transforms plasmid DNA into E. coli. A foreign plasmid or ligation product is inserted into bacteria in this method.
What procedures are employed in E. coli transformation?Bacterial cells can be transformed primarily by heat shock or electroporation. The bacterial cells in both situations must be made competent or permeable to the plasmids you want the cell to spread.
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Match the definition provided with the correct type of membrane transport.
Please help me
The definitions are matched according:
Water diffuses across a partially permeable membrane from a high water concentration area to a low water concentration area until equilibrium is established. Molecules move over a partially permeable membrane from a high concentration area to a low concentration area until equilibrium is attained.
Osmosis occurs when molecules flow via a Partially permeable membrane with the help of a transport protein from a high concentration area to a low concentration area until equilibrium is attained.
Facilitated Diffusion: Molecules that pass across a partially permeable membrane with the help of a transport protein and require energy to move from a low-concentration area to a high-concentration area without achieving equilibrium.
Active Transport: Molecules that flow over a partially permeable membrane with the help of a transport protein and require energy from a low-concentration area to a high-concentration area without achieving equilibrium.
What is the use of osmosis?
By balancing the levels of water and intracellular fluids, osmosis assists in the stability of the organism's internal environment. Additionally, nutrients and minerals enter the cell through osmosis, which is necessary for cell survival.
It is used to preserve the freshness of fruits and meat. Salt preserves meat, fish, and vegetables, but sugar preserves fruits. Bacteria that infect them attack them swiftly.
Preservatives like sugar and salt cause bacteria to lose water and halt their metabolism. The germs will perish as a result.
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What is the primary goal of cellular respiration in eukaryotes?
Answer:
Cellular respiration
Explanation:
Cellular respiration in eukaryotes occurs primarily in the mitochondria. Eukaryotic cells depend on cellular respiration to survive. During glycolysis, the cell breaks down glucose in the cytoplasm with or without oxygen present.
Nucleus,cell membrane, cell wall, mitochondria, cytoplasm, nucleolus,vacuoles, lysosomes,ribosomes, nuclear membrane,centriole,chromatin,
Golgi complex , endoplasmic reticulum,chloroplast
Answer:
CytoplasmNucleusChloroplastRibosomesCell MembraneMitochondrion Nuclear MembraneLysosomesCell WallVacoulesCentrioleendoplasmic reticulumRNAChromosomeschromatinExplanation:
which type of photoreceptor cells demonstrate extensive neural convergence resulting in spatial summation, useful for low light vision?
Rods are the type of photoreceptor cells demonstrate extensive neural convergence resulting in spatial summation, useful for low light vision.
Although they lack the spatial resolution and colour function of the cones, rods are specialised photoreceptors that perform well in low light. They contribute to our ability to see in low-light conditions and to detect movement outside of our visual field.
Rods and cones are the two categories of photoreceptors found in the human retina. When it comes to seeing in low light, rods are in command (scotopic vision). They do not mediate colour vision and have poor spatial acuity. Cones are in charge of colour vision, sharp spatial acuity, and activity in brighter environments.
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a stretch of 100 base pairs of dna contains 15 complete rotations. this dna molecule is please choose the correct answer from the following choices, and then select the submit answer button. answer choices denatured. relaxed. negatively supercoiled. positively supercoiled.
Positively supercoiled molecules make up DNA.
How many base pairs of DNA are supercoiled around each nucleosome?In the nucleoprotein particles known as nucleosomes found in eukaryotic chromatin, the DNA double helix is repeatedly supercoiled. A typical nucleosome has a core composed of 145–147 base pairs (bp) of DNA that wraps around an octamer of histones in 1.7 left-handed superhelical twists (1–3).
What is the mechanism by which information is transferred from one DNA molecule to its daughter molecules?DNA replication is the mechanism by which a cell duplicates its chromosomal DNA after each cell division. After then, the duplicated DNA is separated into two "daughter" cells that get the same genetic material. Chromosome segregation is the term for this process.
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Please help I don’t know what I’m doing: If 3000 J of energy is released from 1kg of air, what would the final temperature be if it started out at 25°C?
The final temperature started out at 25°C would be 27.9°C, if 3000 J of energy is released from 1kg of air.
Equation
The ratio of a material's capacity to absorb heat to the change in temperature is known as heat capacity. In terms of the actual amount of material being taken into account, which is most frequently a mole, it is typically stated as calories per degree (the molecular weight in grams). Specific heat capacity is the heat capacity expressed in calories per gram.
The change in heat of the air can be given by
q = (Cp)mΔT
where,
Specific heat of 1.005 J/gC, and m is the mass of air in the calorimeter in grams.
Delta T is the temperature change.
∆T= T(final)-T(initial)
q = 3000J
T(final)=x
T(initial)= 25
m=1kg = 1000g
q= (Cp)mΔT
3000 = (1.005)*1000*(x-25)
x = 27.9°C
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why is easter island an example of irresponsible resources?
Answer:
Easter island is an example of irresponsible resources because they used deforestation for agriculture and Moai-making led to soil erosion that impacted farming.
Explanation:
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Animals called sponges reproduce by budding. The sponge in this photo formed
buds on the outside of its body.
Which statement describes the process of budding?
Answer: 3. New individuals develop from pieces that break off an individual. (Fragmentation)
Explanation:
Sponges reproduce sexually as well as asexually. Fragmentation, in which a piece of the sponge breaks off, settles on a new substrate, and develops into a new individual, or budding is the two most common methods of asexual reproduction (a genetically identical outgrowth grows from the parent and eventually detaches or remains attached to form a colony). Only freshwater sponges engage in an unusual form of asexual reproduction that results in the development of gemmules. Gemmules are structures made by adult sponges that are resistant to the environment (e.g., in the freshwater sponge Spongilla). In gemmules, a pneumatic cellular layer that may be fortified with spicules surrounds an inner layer of archeocytes (amoebocytes).
Which component of the cardiac conduction system receives action potentials from the sinoatrial node?.
The sinoatrial node receives action potentials from the Atrioventricular (AV) node.
The sinoatrial node (SA node) is the normal pacemaker for the heart. The SA node is located in the upper right atrium and close to the superior vena cava. Pacemaker sources other than the SA Node can be said to be abnormal pacemakers or one of the characteristics of cardiac arrhythmias/dysrhythmias on the EKG image. To carry out its function as a normal pacemaker for the heart, the SA Node is influenced by the autonomic nervous system, namely sympathetic and parasympathetic activity. There is an increase in the work of the SA Node (increased heart rate) and conversely, the presence of parasympathetic activity will decrease the work of the SA Node (decreased heart rate)
The AV Node is the second source of pacemakers after the SA Node. The size of the AV node is smaller than the SA node, located in the lower right atrium, to be precise, close to the tricuspid valve and also close to the coronary sinus ostium.
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how does the concentration of prokaryotic cells at the surface of pelagic water compare with the concentrations at depths below 1000 m?
The concentration of prokaryotic cells at the surface of pelagic water compare with the concentrations at depths below 1000 m as option B: there is a decrease in concentration with increasing depth.
Prokaryotic cell counts often peak in sediments close to the surface and then rapidly decline as depth increases. However, the average cell concentration is still extremely significant at the typical marine sediment depth of 500 m. Prokaryotic cells are believed to have decreased by 97% due to the preferential removal of the most easily degradable organic matter components during burial. As a result, the remaining organic matter becomes more resistant and can only support a smaller prokaryotic population.
The Proteobacteria genus contains the majority of prokaryotic organisms in the ocean. These creatures have a variety of adaptations, such as compressible lungs and swim bladders that resemble lungs, to help them deal with the intense water pressure in their deep-water habitat.
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Complete question is:
How does the concentration of prokaryotic cells at the surface of pelagic water compare with the concentrations at depths below 1000 m?
A) There is a decrease in concentration from 1 m to 1000 m in depth, then a dramatic increase below 1000 m.
B) There is a decrease in concentration with increasing depth.
C) There is a steady increase in concentration with increasing depth.
D) There is an increase in concentration at depths below 1000 m.
Make an inventory. Think about all the chemicals in your house and all the electronic devices you own. Make a list of everything that will need to be disposed of as hazardous waste. Find out how you would dispose of these things properly in your area.
The common household items which can be categorized as hazardous waste are:-
BatteriesOil based paintsMercury thermometerPesticidesToilet cleanersComputersTelevisionsNail polish removerFluorescent light bulbsThe points that need to be considered while disposing these items are as follows:-
Directions for use and storage described on the label of the product should be read carefully, and the instructions regarding its disposal should be followed accordingly.Segregate hazardous waste from regular household waste and dispose of it separately in an environment-friendly manner. Items that are regarded as hazardous should be recycled as much as possible e.g. batteries.Do not flush hazardous waste down the drain as they contain harmful chemicals.To learn more about Pesticides here
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What are the side effects of anabolic steroid use?
(Select all that apply.)
Responses
prostate enlargement for men,
severe acne for men ,
muscle loss for men and women ,
low blood pressure for men and women ,
deeper voice for women
The rock cycle is affected by the biosphere in addition to geological processes. Hypothesize about the role in the rock cycle of the formation of calcium carbonate shells in ocean animals, and plant growth on land.
The rock cycle plays an important role in the process of calcium carbonate formation is that it is built by plankton and corals. Therefore, it is true that the rock cycle is influenced by the biosphere processes as well as the geological processes.
What is the significance of the rock cycle?A rock cycle can be described as the process that leads to the formation of minerals and chemical elements because of the occurrence of natural processes near the oceans and water bodies.
Substances like calcium carbonate (CaCO₃) are one of the influential formations in the rock cycle. The formation of calcium carbonate is highly contributed by the plants and animals to form the plankton as well as the corals on reefs.
Therefore, the significance of the rock cycle has been aforementioned.
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*VOCABULARY*
Which of the following is not related to metallic bond?
A. Alloy
B. Shared electrons
C. Transferred electrons
D. Sea of electrons
Shared electrons is not related to metallic bond.
Positively charged metal ions and the electrons that surround them are attracted to one another, creating metallic bonds. Covalent and ionic bond electrons are shared, but metallic bond electrons are delocalized.
What about metallic bond?Atoms in a metallic substance are held together by a force called the metallic bond. Atoms in such a solid are packed closely together.The attraction between positively charged metal nuclei and their delocalized valence electrons causes metallic bonding, a type of chemical bonding between two or more metal atoms.Metallic bonding is particularly prevalent in minerals involving transition metals. In most cases, the outermost electron shell of each of the metal atoms overlaps with a significant number of neighboring atoms. Minerals with metallic bonding include gold, silver, and copper. Metallically bound compounds are efficient heat and electricity conductors because valence electrons can travel freely throughout the structure. Strength, malleability, ductility, thermal and electrical conductivity, opacity, and brilliance are a few qualities of metallic bonding. These features serve as important findings to define metallic bonding. Electrostatic attraction between metal captions and delocalized electrons produces metallic bonds. Many of the physical characteristics of metals, like conductivity and malleability, are explained by the type of metallic bonding that exists.Learn more about metallic bonds here:
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A person has the genotype GG. Where did they get that genotype from?
The genotype GG dominant for both the alleles is inherited from both the parents, i.e., mother and father.
Genotype is defined as the composition of genes of an organism. The genotype determines whether a trait a person possesses is dominant or recessive. It also clarifies if the trait is homozygous dominant or heterozygous.
Alleles are the alternative forms of a gene. These are the result of mutations. Usually there are two allelic forms of a gene but there can be more than two alleles as well. For example, in the question the genotype GG has two similar form of alleles which is G individually derived from mother as well as father.
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What are the potential impacts of coal mining on the environment? Include the subject of fossil fuels
Coal mining has the following impacts on the environment:
- Landscape alteration: due to the deforestation conducted to clear the mining areas, which destroys forests and natural wildlife habitats. The destruction of the forests also promotes soil erosion, flooding and stirs up dust pollution which can cause respiratory problems to the populations nearby the mining area. Mountains are also "removed" during the mining process.
- Release of methane (CH₄), which is a greenhouse effect gas, and carbon monoxide (CO) which is a toxic gas that may affect the people and animals in the area.
- Water pollution: Sulfuric acid is formed when coal is exposed to the air and water, this acid washes down heavy metals, such as copper, lead, or mercury, which acidifies and pollutes the local streams and water supplies.
Coal is considered a fossil fuel because it was formed out of the remains of forests that grew on swamp areas during the Carboniferous era (350 million years ago). Successive layers of plants were later covered by dirt and water, which stopped their decaying process. With the eras, the weight of the layers above them, and the heat produced a series of chemical and physical changes that allowed the plant remains to become coal.