Answer:
Yes
Explanation:
Mutation in the hemoglobin gene can cause sickle-cell anemia. The defective protein found in sickle-cell anemia causes red blood cells to “sickle”—become a misshapen C shape. These misshapen cells abnormally stick to each other and can become trapped by leukocytes (white blood cells) that are rolling or paused on the endothelial cells lining the vessel. This causes blockages of small blood vessels, causing severe pain and strokes called vaso-occlusive crisis. A new drug that binds and blocks selectin proteins is in phase III clinical trials to test for improvement in patients' symptoms. Why might this be an effective treatment for vaso-occlusive crisis?
At which time of year would mitosis in a plant occur most frequently? Explain why?
Answer:
it would be based on the most common prophase time of year is.
Explanation:
I don't know to be honest.
In plants, mitosis occurs most frequently during the periods of growth such as the during the periods of inactivity such as during germination and springtime bud formation.
What is Mitosis?Mitosis is the cell division which occurs in all the somatic cells in the plant body as well as in the animal cell. Mitosis results into the formation of diploid cells.
Mitosis occurs most rapidly in the meristematic tissues of the plants. These are the zones of growth in plants.
In plants, mitosis occurs most frequently during the periods of growth, for example when they come out of the periods of inactivity, such as during seed germination and spring time bud formation.
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You are studying ion channels and have set up model lipid vesicles containing the three following transporters:
1. a Na+ /H+ antiporter driven by the Na+ concentration gradient.
2. The common 3Na+ /2K+ pump.
3. K+ leak channels. The experiments are designed such that all three transporters are oriented in the model lipid bilayers in the same direction they would be in the plasma membrane of a cell and that concentration gradients in vitro mimic the concentration gradients experienced by cells (e.g., the extracellular Na+ concentration is similar to the concentration outside of the vesicle whereas the concentration in the lumen of the model vesicles is similar to intracellular Na+ levels).
Required:
a. Draw the arrangement and ion flow of the three types of transporters in the model membranes.
b. What do you predict will happen to the pH of the vesicle lumen if you treat the model membranes with the drug oubain that impairs function of the 3Na+/2K+ pump? Briefly explain your answer in terms of what happens with each transporter.
Answer and Explanation:
a) you will find the arrangement and ion flow of the three types of transporters in the model membranes in the attached files.
K+ leak channels are channel proteins that allow K⁺ to leave the cell in favor of its concentration gradient. It keeps a stable equilibrium by taking out K⁺ that the 3Na+ /2K+ pump brings into the cell. Any alteration in the pump leads to an alteration in the leak channel functioning. Na+ /H+ antiporter is an integral membrane protein, and a secondary transporter is responsible for the interchange of H+ and Na+ through the membrane with no use of energy. It regulates pH within the cell. It responds to the Na+ and H+ concentration gradient, determined by the 3Na+ /2K+ pump. An alteration in the pump functioning produces a change in the Na gradient and consequently affects the antiporter interchange action. 3Na+ /2K+ pump is an integral protein that transports K+ and Na+ against the electrochemical gradient. A significant amount of energy is used to make the pump function. It brings K+ into the cell and takes Na+ out of it. It keeps the membrane potential and the electrochemical gradient constant. The pump function is associated with the leak channels and the antiporters function.Under normal conditions, the cell interior has a lower pH than the exterior. The K+ concentration is higher in the interior, while the Na+ concentration is higher in the cell exterior. The interior of the cell is always more electronegative than the cell exterior.
b)
The drug ouabain inhibits the pump. It impedes the Na+ exit and the K+ entrance. It occurs a sharp increase in the Na+ intracellular concentration, which influences the Na+ /H+ antiporter that changes the ions´ direction, taking out Na+ and bringing in H+ to compensate the intracellular Na+ excess. There is also a decrease in the leak channel function, which does not allow K+ to leave the cell.
Whenever the pump is inhibited, there is an increase in the intracellular pH, because Na+ concentration increases in the interior.
Four friends were arguing about the time scales for geoscience prosses related to plate tectonics. They each had different ideas about how long it takes for the motion of earth's tectonic plate to produce changes on earth's surface. This is what they said:
Natia: The movement of Earth's plates forms landforms over million of years.
Zeke: The movement of Earth's pates causes rapid events that can occur within seconds.
Akoni: The movement of Earth's plate only moves continents across Earth's surface
Jan: The movement of Earth's plates only moves continents across Earth's surface.
Which student do you agree with?
Natia
Zeke
Akoni
Jan
Poiseille's law is often used to calculated the arteriolar blood flow. According the this law, the following all affect blood flow:-radius of vessel-length of vessel-viscosity of blood-pressure gradientWhich of these has the GREATEST affect on blood flow?
Answer:
a. radius of vessel
Your neighbor, Mr. Turner, doesn't think that alternative energy resources like water, wind, or solar are important. He asks, "Why not just do what we have always done?" To help Mr. Turner understand, justify the use of alternative energy resources instead of fossil fuels with at least one real life example.
please help
Answer:
--
One of the amazing things about alternative energy resources is that they are renewable, unlike fossil fuels. The use of fossil fuels, such as coal and natural gasses, can contribute a lot to pollution since fossil fuels are usually processed through factories and plants. With water, wind, and solar energy, it is much easier to gain electricity with those methods rather than others, and much cheaper.
How does the proofreading mechanisms in viruses affect the frequency of the mutations a virus typically undergoes?
Answer:
Explanation:
DNA polymerases are the enzymes that build DNA in cells. DNA polymerase also proofread their work to check for any error the process of which is called proof reading.
If the polymerase detects that an Incorrectly paired nucleotide has been added, it will remove (splicing) and replace the nucleotide with the correct one before it continues with DNA synthesis.
Mismatch repairing also corrects other errors that omit proofreading. They fix mismatched base pairs, replace some insertion and deleted base pair that can result into mutations.
When an error is corrected the rate of mutation is reduced this is because mutation results from error during the DNA formation process either through Insertion of a wrong nitrogenous base, or deletion leading to formation of an entirely new amino acid sequence that result into abnormal phenotype.
Where do substrates bind on an enzyme?
active site
surface receptor
voltage-gated
channels
calcium channels
Think about what you have had to eat lately, chances are you have enzymes in your body specifically designed to
help break that molecule down. What are 3 types of molecules that may need to be broken down in your body
Answer:
The human body uses three types of molecules to yield the necessary energy to drive ATP synthesis: fats, proteins, and carbohydrates.
Explanation:
Your welcome<3
Got it from www.nature.com
Which best compares self-renewal and differentiation?
Answer:
Only differentiation creates more of the same types of cells. ... Only self-renewal creates more of the same types of cells. Only self-renewal depends on gene expression
Answer:
Only differentiation creates more of the same types of cells. ... Only self-renewal creates more of the same types of cells. Only self-renewal depends on gene expression.
Explanation:
please give me brain list and follow
Cells can be prokaryotic or eukaryotic. Which of the following structures is present in eukaryotic cells but not in prokaryotic cells?
Answer:
nucleus
Explanation:
eukaryotic has a nucleus, prokaryotic does not
-Present-day mitochondria and chloroplasts probably evolved as a consequence of early endosymbiosis: the ancestor of the eukaryotic cell engulfed a bacterium, and the bacterium continued to function within the host cell.
1) What is the Endosymbiont theory? What is the evidence supporting this theory?
Answer:
The evidence suggests that these chloroplast organelles were also once free-living bacteria.
Explanation:
The endosymbiotic event that generated mitochondria must have happened early in the history of eukaryotes, because all eukaryotes have them.
:)
Question 1 (1 point)
Tubelike cells that carry food from the leaves to other parts of the plant are called?
Question 1 options:
Xlyem
Phloem
Choloropasts
Question 2 (1 point)
Liverworts are non vascular plants and grow?
Question 2 options:
On tree tops
Flat and close to the ground
Tall like trees
Question 3 (1 point)
Structures that anchor vascular plants and take in water and minerals are?
Question 3 options:
stems
leaves
roots
flowers
Question 4 (1 point)
Which of the following is not true of mosses, liverworts, and hornworts?
Question 4 options:
They are non-vascular plants.
They have true roots, stems, and leaves
They grow in moist places.
They are small and low-growing.
Question 5 (1 point)
Which is the best explanation of water transport in a non-vascular plant like the one shown below?
Question 5 options:
Water moves only in the roots.
Water moves from cell to cell.
Water moves through a system of tubes.
Water moves directly to the flowers from the roots.
Question 6 (1 point)
Looking at the diagram above. What is the function of the anther?
Question 6 options:
catches the sticky pollen
produces the pollen
becomes the fruit
passage tube for pollen
Answer:
1) xlyem
2) flat and close to the ground
3) roots
4) they have true roots, stems, and leaves
5) water moves from cell to cell
6) produces pollen
Explanation:
The answers to the following questions are as follow:
1) xylem
2) flat and close to the ground
3) roots
4) they have true roots, stems, and leaves
5) water moves from cell to cell
6) produces pollen
What are vascular plants?Vascular plants are a group of plants that have specialized tissues for conducting water, minerals, and nutrients throughout the plant. These specialized tissues, called vascular tissue, consist of xylem and phloem.
Xylem is a type of vascular tissue that is responsible for transporting water and minerals from the roots to the rest of the plant. It consists of tubes made of dead cells with thick cell walls that form a continuous network throughout the plant.
Phloem is another type of vascular tissue that is responsible for transporting sugars and other nutrients throughout the plant. It consists of tubes made of living cells that are arranged in a circular pattern around the xylem.
Vascular plants are important because they are able to grow to larger sizes than non-vascular plants due to their ability to transport water and nutrients throughout the plant. Examples of vascular plants include trees, grasses, and flowers.
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what fraction is a punnett square with SS Ss Ss ss
Answer:
ss=1/4 *for all
Explanation:
si en un instituto se bachilleran 130 estudiantes. si en el día de la graduación lo ordenaron en sucesión aritmética con 20 en la primera fila y 32 en la última, cuantas filas se formaron?
Answer:
Se forman 5 filas.
Explicación:
Se forman 5 filas si se ordenaron 130 estudiantes el día de la graduación en sucesión aritmética con 20 en la primera fila y 32 en la última porque se agregan 3 estudiantes en cada fila después de la primera fila. La primera fila tiene 20 estudiantes, la segunda fila tiene 23 estudiantes, la tercera fila tiene 26 estudiantes, la cuarta fila tiene 29 estudiantes y la quinta o última fila tiene 32 estudiantes.
Monoculture is always a bad agricultural practice.
Question and answer or true or false
2. What does proper disposal of hazardous waste prevent?
mRNA has 1500 bases. If all of them are used for coding amino acids, the number of amino acids in polypeptides will be ?
Answer:
499
Explanation:
The organelle that is the site of cellular respiration is the
o mitochondrion
O nucleus
o chloroplast
o ribosome
Answer:
hope this helps
Explanation:
mitochondrion
Answer:
mitochondrion
Explanation:
Plz mark brainliest thanks
Which of the following is not an example of how renewable biofuels could replace nonrenewable resources?
A)
Wood chips could replace methane.
B)
Sugarcane and corn products could be used to burn instead of coal.
C)
Palm oil from renewable trees could replace nonrenewable biodiesel.
D)
Residues from animals such as manure could replace the use of methane.
E)
Residues from agricultural sources could be used as fuel.
Answer:
I believe the answer would be:
E) Residues from agricultural sources could be used as fuel.
Let me know if I'm wrong or right since I'm not too sure.
Answer:
E.) edg 2021
Explanation:
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A scientist finds a tiny fragment of a bone too small to be classified by its appearance. The scientist studies the tiny fragment and concludes that it belonged to an ancient primate species. How was the scientist able to classify the bone?
Answer:
Through a microscope.
Explanation:
A stereozoom microscope is a handy instrument for magnifying small features on the surface of a bone.
Answer:
Through a microscope
Explanation:
I just know
A person who is interested in finding a cure for diabetes, in which the pancreas does not produce insulin, might pursue a career in
endocrinology
gene therapy
neuroscience
sports medicine
Answer: endocrinology
Answer:
Endocrinology
Explanation:
I got 100% on the test
What is true regarding a new baby girl's ovaries?
Choose all the right answers.
Identify the structures associated with the male part(s) of a flower.
pistil
egg
anther
ovary
stigma
pollen
stamen
NEED HELP NOW!!!
The unit of measurement for forces is called
Answer:
I am pretty sure its called a Newton=unit of force
Explain how might studying alleles help scientists learn about genetic diseases.
Answer:
they can study these preserved genes and compare the genomes of different species to find similarities and differences that improve their understanding of how human genes function and are controlled. this helps researchers develop new strategies to treat and prevent human disease.
Explanation:
True or false a proton is a negatively charged particle that resides in the nucleus of an atom and has a mass of 1 and a charge of -1
Answer:
False
Explanation:
Protons have a positive charge
How do organisms obtain energy from an ecosystem?
Answer:
Plants obtain food by photosynthesising
Herbivores obtain food by eating plants
Carnivores obtain food by eating an animal
How did scientists determine that gorillas are closely related to humans?
Tubelike cells that carry food from the leaves to other parts of the plant are called?
Question 1 options:
Xylem
Phloem
Chloroplasts
Answer: Phloem carry food from the leaves to other parts of the plant
Explanation: Xylem carry water and Chloroplasts are organelles in cells wich allow the plant to photosynthesise