The following negative impacts on land resources caused by human activity are:
- Erosion increase due to road construction;
- Chemical used in mining entering the soil;
- Desertification caused by desforestation.
The others options are natural impacts in the environment.
Explain the interaction of flexors and extensors. Refer to the role of tendons, ligaments and bones. Give at least 5 examples of flexor-extensors pairs and the movements they control
The flexor muscles are muscles that bend joints while extensor muscles are muscles that straighten these joints. These muscles are connected to the bone by tendons. Ligaments do not connect muscles to the bone, instead, it connects bones to another bone. Flexor and extensor are what you call antagonistic muscle pairs that oppose the function of each other.
Examples of flexor-extensor pairs in the body are the biceps and triceps, quadriceps and hamstrings, pectorals and trapezius, gluteus maximus and hip flexors, and tibialis anterior and extensor hallicus longus.
Movement of each pair:
• biceps and triceps ,(located in the arms) - Biceps are muscles that contract bends the elbow towards the body, while triceps will relax the muscles or straighten them.
,• quadriceps and hamstrings, (located in the knees area) - Quadriceps bends and hamstrings straightens. It helps you bend your knee.
,• pectorals and trapezius, (located in the chest to shoulders area) - The pair will move the arms towards the body and away from the body. It gives us the ability to swim. The pectorals are major muscles of the chest area that can both extend and bend since it is joined in with two different heads. The trapezius is located at the upper back area to the shoulders of the body and aids the pectorals in the extension and bending of the arms.
,• gluteus maximus and hip flexors, (located in the hip area) - It is important for standing, walking, and staying upright. Gluteus maximus is the major muscle in the thigh that straightens the lower limbs. Hip flexors are a collection of flexor muscles that bend the thigh forward.
,• Tibialis anterior and extensor hallicus longus ,(located in the foot) - The tibialis anterior flexes the ankle away from the foot while the extensor hallicus longus bends the foot upward towards the body.
15. A pedigree chart is a visual representation of the frequency and appearance of phenotypes of a particular gene. The figure below shows a pedigree chart for red-green colorblindness in a human family. The disorder is sex-linked recessive (Xb). Since the genes for the and green color receptors are located on the X chromosome, males are more likely to be affected than females.Typically, each individual in a pedigree chart is assigned a number. The genotype for Individual 1 is XbY, and the genotype for Individual 4 is XBXb, the genotype for Individual 24 is XbXb.Suppose individuals 21 and 22 have only male biological children. Based on the pedigree chart, on average, what percent of children are colorblind?50%25%0%100%
Remember that colorblindness is an X-linked recessive disorder. Now, let us denote by "a" the recessive (affected) allele and by "A" the dominant (normal) allele.
Now, consider the following pedigree chart:
Suppose individuals 21 and 22 have only male biological children. First, notice that individual 21 is a normal female (no carrier). This means that her genotype:
[tex]X_AX_A[/tex]On the other side, individual 22 presents the affected allele. Since individual 22 is a man, this means that his genotype for the colorblindness would be:
[tex]X_aY[/tex]thus, the Punnett square of the crossing of these two individuals would be:
Now, according to the problem, individuals 21 and 22 have only male biological children. Then, according to the above Punnett square, we can infer that the percent of children (male biological children) that are colorblind is:
0%
we can conclude that the correct answer is:
Answer:The percent of children (male biological children) that are colorblind is:
0%
30) In a dideoxy chain-termination method, you added dideoxy cytosine only instead of dNTPs. What would be the outcome of your sequencing reaction? a) They will all be the same size and end in a G b) They will be of different sizes, all ending in a G c) No product will be formed d) They will be of different sizes, all ending in a C e) They will all be the same size and end in a C
If you add only cytosines instead of dNTPs, this means hat the sequencing would stop after tfilling all the terminal cytosines because it cannot add the other nucleotides needed, so you would end with fragments of different sizes, all of them ending in Cytosine (option d would be correct).
building polymers requires the process of ______.
-hydrolysis (adding water)
-cellular respiration
-dehydration synthesis (removing water)
-gluecolysis (adding glue)
How can high temperatures disrupt dna replication? Help I need it asap
DNA is being denature with high temperature application. DNA's hydrogen bonds are disrupted by heat. The DNA flexibility is being boosted by heat thereby resulting to a condense folding of DNA chain (double-stranded). Due to this effect of destabilizing the DNA, the DNA duplex is entirely detached. Although DNA replication also requires heating, high temperatures (melting point) will greatly impact its replication. DNA extracted will give increase yield at lower temperature than in high temperature. Enzymes involved in DNA replication are affected by temperature. It can be denatured at high temperature and its actions will slow down at low temperature.
Which of the following choices is an example of a non-specific barrier?skinwhite blood cellslymphatic systemthe immune system
The defense system of the body
The skin is a non-specific barrier because it protects the body from non-especific pathogen agents, covering a major diversity of possible disease carriers.
What type of bonds give
water special
characteristics?
A. hydrogen bonds this
B. non-polar bonds
C. covalent bonds
D. adhesion bonds
Answer: c
Explanation:
Answer:
c
Explanation:
Which part of the body is responsible for all high-level functioning and which part of the brain does that structure belong to? I picked ‘A’ but I’m not sure if I’m correct
Answer
Cerebrum, forebrain
Explanation
The cerebrum, the largest part of the human brain, is associated with higher order functioning. The structures in the forebrain include the cerebrum, thalamus, hypothalamus, pituitary gland, limbic system, and the olfactory bulb.
In which case is the energy involved farthest from being kinetic energy?A.random molecular movement B.light C.heat D.the energy in chemical bonds E.sound
A random molecular movement generates kinetic energy. Light and sound are not necessarily neither kinetic energy nor potential energy. Both can become kinetic energy if the right medium is used. Heat is another term for thermal energy and it can also produce kinetic energy if the right medium is used. The energy in chemical bonds is potential energy. If the bonds are broken down, the energy released will become kinetic energy.
ANSWER: D. The energy in chemical bonds
Which of these is a heterotroph?O plantO producerO consumerOphytoplankton
As we know an heterotroph is an organism that obtains it energetic input from an external source
The enzyme catalase is an important chemical in the functioning of what?
The enzyme catalase is in charge of the decomposition of hydrogen peroxide, a molecule that is toxic for the cell. This enzyme transforms hydrogen peroxide (H2O2) into water (H2O) and oxygen (O2), two elements non-toxic and necessary for cells. It is found on the peroxisomes of all cells and it is very important mainly on blood cells.
What is the overall goal of cellular respiration?
Cellular respiration is a way where the food that we consumed is being converted to energy out of sugar which is in the form of glucose. The organism is combining the oxygen with the food and diverting the energy and discarding carbon dioxide and water as its waste products. It occurs in the mitochondria of an animal or plant organisms. The overall goal of cellular respiration is to break down the sugar in the form of glucose with oxygen in order to release energy (ATP). ATP is the energy that the body can use for energy.
21.Myopia is connected withA. earsB.eyesC. lungsD.None of these
Myopia is a problem that affects vision because the image is not formed correctly.
Therefore, people with myopia have difficulty seeing distant objects/people.
Therefore, myopia is related to the eyes. The alternative "B" is correct.
What is a law?
A. A well-tested explanation as to why something occurs that is generally accepted
B. An assumption made about an experience
C. A scientific explanation for a set of observations that can be tested
D. A proven, universal truth that states what happens
Answer:
I would say D
Explanation:
A law is saying WHAT is happening
A theory is saying WHY it is happening
Answer: D. A proven, universal truth that states what happens
Explanation:
In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. Laws have not had any contradicting observations.
Compare and contrast the structure and function of the three components of the cytoskeleton: microtubules, intermediate filaments, and microfilaments.
MICROTUBULES
Structure: Hollow cylinders that are made up of repeating protein structure known as tubulin; thickest among the three
Functions: Provides rigidity, gives shape to many cells, major components of cilia and flagella, participates in the formation of a spindle during mitosis
INTERMEDIATE FILAMENTS
Structure: thicker than microfilaments and thinner than microtubules (in between among the three types of the cytoskeleton); protein composition is lamin, vimentin, and keratin
Functions: Forms the true skeleton of the cell, anchors the nucleus, and position it within the cell, giving elasticity to withstand tension,
MICROFILAMENTS
Structure: Protein composition of it is actin; thinnest among the three
Functions: Regulate cell shape, involve in some cell to cell or cell to matrix junctions, permits the movement of the specific cell through the formation of cytoplasmic extensions
When cells are damaged, they release proteins called_____, which causes the area to become flooded with fluid and clotting elements.A. HistamineB. PathogensC. NeutrophilsD. Lysozyme
Answer:
Histamine ✨
Explanation:
Histamine is a compound released from cells. This histamine release is usually in response allergic and inflammatory reactions and injuries.
Histamine causes the contraction of smooth muscle and dilation of capillaries when released.
A man with type AB blood marries a woman with type A blood. Is it possible for them to have a child with type B blood? Use Punnett squares to support answer
No, it is impossible for them to have type B blood.
Cells are made of organelles, specialized structures that each perform specific functions that help the cell maintain homeostasis. This is much like the body systems work together to help the body maintain homeostasis. Consider each of the organelles and body systems paired below. Which pairs perform similar functions? Select ALL four that apply.
Responses
A integumentary system: cell membraneintegumentary system: cell membrane
B circulatory system: ribosomecirculatory system: ribosome
C digestive system: lysosomedigestive system: lysosome
D nervous system: nucleusnervous system: nucleus
E respiratory system: mitochondria
The body systems that match with the correct organelle are: (A) integumentary system: cell membrane; (C) digestive system: lysosome; (D) nervous system: nucleus; and (E) respiratory system: mitochondria.
Lysosome is the single membrane cell organelle that acts as the digestive system of the cell. It does so because it not only helps in the digestion of food particles, but also digests the foreign invaders so that the cell can protected from any kind of infections.
Nucleus is a cluster of neurons in the nervous system. Neurons are the cells that are basic unit of nervous system. Each neuron structure consists of cell body, with dendrites emerging from it. A long axon extends which has axon terminal at the end.
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Give kudzu classification and general description.
Kudzu is a leafy vine. Its scientific name is Pueraria montana. It was introduced in the U.S. from Japan and China in the decade of 1930 to prevent soil erosion. As it doesn't have predators, it grows and spreads easily in the country. It is woody and it has approximately 60 feet, growing in each season. Its leaves are large and has three broad leaflets, with hairy margins. The flowers are purple and the seed pots are flat and hairy. Kudzu has been studied to understand its many possible benefits to human health, as it is traditionaly used in its place of origin to treat menopausal symptoms, alcoholism, diabetes, fever, among other conditions. It became an invasive species due to the lack of predator, causing harm to many environments where it has spreaded.
Can someone help me label this I’ve been stuck overnight studying for finals and I can’t seem to figure this out.
To label the structures and functions of the immune response in the figure, we can start by identifying the cells:
Structures:
a- Antigen;
b- immune cell - most cases naive B-cell;
c- immune cell - activated can be a B-cell or T-cell;
d- Epitopo of the antigen;
e- Antigen in direct contact with the immune cell
f- Immune cell in direct contact with the antigen;
g- Epitopo for antigen identification;
h- Immune cell - activated and that can determinated the antigen and kill it - T-cell (antibodies).
Functions:
a - pathogen, the cell responsible to cause the disease;
b - immune cell that identify the antigen;
c - immune cell that can act and find the antigen in the body;
d and g - proteic structure that act like an ID or presentation card for the cells;
e and f - the cellular contact with the pathogen;
h - cells that are responsible to deal with the pathogen and protect the body.
Which of the following is true regarding the cell theory? Choose all answers that apply: Choose all answers that apply: (Choice A) A Single cells are non-living. (Choice B, Checked) B All living things are made of many cells. (Choice C, Checked) C Cells can only be formed from other cells. (Choice D) D Cells make up atoms.
Answer:
B and C are the answers for this question
At the complete end of cellular respiration, how many molecules of ATP are produced?Question 20 options:A) 34B) 15C) 38D) 26
To answer this question we needd to remember how meny ATP, NAD and FAD are produced on each step of cellular respiration, so the account is a follows:
Glycolisis, 2ATP, 2NADH = 6ATP
Aerobic phase (krebs cycle, Acetil CoA), 4ATP, 2FADH, 8NADH= 32 ATP
Now we must remember that in glycolysis we spent 2ATP so the net production of the whole process is 38 ATP minus 2 ATP, which gives us 36ATP.
Therefore we can say that the correct answer is option C as 38 ATP are produced in total.
Just like vertebrate animals, plants possess excretory systems. One way that plants excrete waste products is by opening pores in the surfaces of their leaves. These pores, called stomata, help a plant maintain homeostasis by allowing the plant to
A.
release substances, such as oxygen and water.
B.
collect substances, such as ammonia and salt.
C.
destroy substances, such as sap and uric acid.
D.
make substances, such as chlorophyll and resin.
Stomata are pores on the leaves' surfaces that allows CO₂ entrance, while O₂ and water leave the plant. Option A is correct. Release substances, such as oxygen and water.
What are stomata?
Stomata are pores on the leaf's surfaces, surrounded by two kidney-like guard cells, which regulate their opening.
Guard cells can expand or contract according to the plants' needs, causing the stomata to open or close.
These pores allow gas interchange and water expelling. Stomata opening and closure depend on water and CO₂ concentration inside the plant.
If the plant is dehydrated, the stomata close. If it is not dehydrated, it opens.If CO₂ levels are too low, stomata open to gain it.
Stomata action is closely related to photosynthesis by controlling gas interchange -CO₂ and O₂-, and cell transpiration -water release-.
Gas interchange occurs when CO₂ moves into the leave cells through opened stomata. This gas is used during the light-independent reactions of photosynthesis (The Calvin cycle). Meanwhile, during the light-dependent reactions, O₂ is released and moves out of the plant through opened stomata.
Water balance occurs when stomata regulate water motion through transpiration. If the plant is dehydrated or climatic conditions are hot and dry, the plant limits water exit by closing its stomata. In this way, more water is available for the plant to photosynthesize under unfavorable situations.
Among the options, A is the correct one. Release substances, such as oxygen and water.
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Is Kudzu (the invasive species) an autotroph? Explain shortly Does it eat actual food?
Kudzu as an autotroph means that produces its own food (any inputo of energy is actueal food), in this case through photosynthesis, thanks to chlorophyll it captures light from the sun and along with CO₂produces the needed glucose to sustain energetic input in the cells. Another factor is the soil from which obtains nitrogen phosphorus and other minerals necessary to maintain cell function.
Which of the following choices is NOT part of the chloroplast?ооооcristaestromathylakoidschlorophyll
The parts of a chloroplast are the inner membrane, outer membrane, intermembrane space, thylakoid membrane, stroma and lamella.
Chlorophyll is the green pigment found within the thylakoid membrane.
Cristae are found on the inner membraine of mitochondria in the cell cytoplasm.
Answer - Option 1 - cristae
Need to know which one is correct for cell bio
The motor proteins that move along the cytoskeleton's microtubules are called kinesins. Actin, on the other hand, dissociates from myosin II, the head group, following each power stroke. As a result, the first option is the one that is correct.
Motor proteins with the ability to actively move along actin filaments and microtubules, respectively, are myosin and kinesin.
One of the two main groups of motor proteins that travel along the cytoskeleton's microtubules is kinesins. The two head groups of the kinesin molecule cooperate to move down the microtubule. One head binds to actin as the other moves; the first head then releases actin while the second head binds.
Myosin II, on the other hand, has a head group that functions independently and actin that dissociates after each power stroke.
As a result, the first option is the one that is true.
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A person with DMD had DNA that does not code for the proteindystrophymusclesduchenneO dystrophin
the answer is dystrophin
as dystrophin is protein found in cytoplasma
Explanation: In individuals with Duchenne muscular dystrophy (DMD), there is a mutation in the gene that codes for the protein dystrophin. Dystrophin is an essential protein involved in maintaining the structural integrity of muscle fibers. The mutation in the DMD gene results in the absence or severely reduced production of functional dystrophin protein.
As a result, without the production of dystrophin, the muscles in individuals with DMD gradually weaken and degenerate over time. This leads to progressive muscle weakness, difficulty in movement, and other associated symptoms of the disorder.
over the course of 45 years the moth population would change by ?
Over the course of 45 years the moth population would change by colour because of the effects of Industrial Revolution. This is due to the effects of air pollution reffered to as industrial melanism. During this period, there was an increased in the population of dark-coloured moths. As an effect, the pale-colored moths were extra detectable to predators.
"Dinosaurs first appeared and became the dominant terrestrial vertebrates. Birds first appeared, evolved from a branch of theropod dinosaurs. The first mammals also appeared but would remain small. Flowering plants appeared and would rapidly diversify throughout the period. "These are characteristics of which era?CenozoicPrecambrianMesozoicPaleozoic
The correct answer is MESOZOIC ERA
The Mesozoic era (middle life) is known as the age of dinosaurs in whcih they evolved from earlier reptiles in order to fill the niches on land, water, and in the air. This era was also where the mammals evolved but were in small size. Flowering plants also start to appear.
01. A Study is Being Planned to Examine the Effects of Drug 911-918. The Goal of the Study is to Examine the Effects of Drug
911-918 on Human Blood Pressure Control,
Select the Best-Correct Statements as it Pertains to the Control Group and Experimental Group.
m
The Control Group Receives No Drug 911-918.
The Control Group Receives Drug 911-918.
The Experimental Group Receives No Drug 911-918.
The Experimental Group Receives Drug 911-918.
The Best-Correct Statements as it Pertains to the Control Group and Experimental Group are:
The Control Group Receives No Drug while The Experimental Group Receives No Drug 911-918.What are the control and experimental group in a study?
The control group in a study is the group in which no changes are applied to the group.
In the control group, the variables are kept constant, hence, the control group is also known as the constant group.
The experimental group in a study is the group to which the treatment being studied is applied. The control group receives the treatment of the variable under study.
Hence, the group that receives the drug 911-918 is the experimental group.
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