Which of the following occurs while
homologous chromosomes are paired
up?
A. They create 2 haploid cells.
B. They contain 6 chromatids.
C. They exchange portions of their DNA.
D. They produce two diploid cells.
Answer:
the answer is d hipe it Helios have a nice day
After nervous stimulation stops, calcium ions returning to the sarcoplasmic reticulum prevent ACh in the synaptic cleft from continuing to stimulate contraction True False
Answer:
False.
Explanation:
Neurotransmitter release occurs from the nervous terminal or varicosities in the neuronal axon. When an action potential reaches the nervous terminal, the neurotransmitter is released by exocytose. The molecule binds to its receptor in the postsynaptic neuron, triggering an answer. As long as the signal molecule is in the synaptic space, it keeps linking to its receptor and causing a postsynaptic response. To stop this process the neurotransmitter must be taken out from the synaptic space. There are two mechanisms by which the neurotransmitter can be eliminated:
• Enzymatic degradation/deactivation: There are specific enzymes in the synaptic space, which are in charge of inactivating the neurotransmitter by breaking or degrading it. The enzyme acetylcholinesterase prevents ACh from continuing to stimulate contraction.
• Reuptake: Receptors located in the presynaptic membrane can capture de molecule to store it back in new vesicles for posterior use. These transporters are active transport proteins that easily recognize the neurotransmitter.
Help!!Quickk!!!!!!!!!!!!
Answer:
b: moon attraction to the sun
(drag and drop) (20 points)
Answer:
Less stable : An ecosystem with populations that mate with only related species
Less stable : An ecosystem that has many species at every trophic level
More stable : An ecosystem with populations that mate with unrelated species
More stable : An ecosystem that has very few species at every trophic level
Hemophilia A is an X-linked recessive disorder. What is the probability that a son will have hemophilia if the parents are a normal man and a woman who is a carrier
Answer:
none
Explanation:
Because the four options are: XX XX Xx Xx. There will be a 50% chance of a carrier but no actual hemophilia.
The probability that the son will have hemophilia if the parents are a normal man and a woman who is a carrier is 50%. The correct option is C.
What is Hemophilia A?A deficiency in the blood clotting factor VIII results in hemophilia A, an inherited bleeding disorder. Lack of factor VIII prevents the blood from clotting effectively to stop bleeding.
Due to a rare disorder called hemophilia, the blood does not clot normally because it lacks enough blood-clotting proteins. If you have hemophilia, you may bleed more profusely and for a longer period of time than you would if your blood clots normally.
A pedigree can be used to trace the X-linked recessive disorder (Xh) hemophilia through the generations. This (D) had hemophilia and passed away as a result of complications. Hemophilia is a bleeding disorder that causes abnormal blood clotting, which lengthens the time it takes for an injury to bleed.
Therefore, the correct option is C, 50%.
To learn more about Hemophilia A, refer to the below link:
https://brainly.com/question/1428363
#SPJ12
The question is incomplete. Your most probably complete question is given below:
- 0%
- 25%
- 100%
- 50%
- 75%
is the outermost layer of the animal cell
[tex]\color{Black}\huge{Answer} [/tex]
It is the outermost layer in the animal cell and is found just inside the cell wall in the plantcell.Answer:
The Cell Membrane is the outer layer of a cell that separates it from the In both plant and animal cells, the cell membrane is found.
In an animal cell, it is located just within the cell wall, while in a plant cell, it is located just inside the cell wall. Cholesterol is present in the membrane of animal cells, but not in the membrane of plant cells.
Explanation:
An animal cell's outermost layer is the cell membrane.
It is found immediately under the outermost cell wall layer in plant cells.
It is made up of the following components:
a bilayer of phospholipids.Membrane proteins are proteins that are found in the membrane ofChannels in the membraneCholesterol.Receptors that send forth signals.During cell signaling, lipid rafts are used to attach intracellular proteins.It has a fluid or mosaic texture, and the molecules in the layer can move around.
How many capillary beds must a red blood cell pass through to move from an artery in the left arm to the left ventricle of the heart
Answer:
two capillary beds
Explanation:
Capillary beds are networks of capillaries that supply blood to the organs and/or areas of the body, in which nutrients and gas exchange (i.e., O2 and CO2) between red blood cells and tissues take place. Smaller arteries (i.e., arterioles) diverge into capillary beds composed of 10 to 100 capillaries, the smallest blood vessels in the body that connect the arterioles and the venules. Red blood cells usually flow into a capillary bed from a metarteriole (i.e., a microvessel that connects arterioles and capillaries). Red blood cells sometimes pass through two capillary beds before reaching the heart. The left heart ventricle is a muscle required for pumping red O2-rich blood out through the aortic valve into the aorta, whereas arteries are large blood vessels that branch into arterioles in order to carry blood to the capillary beds.
Why is it possible for a FPR (formyl-peptide receptor) to detect a formyl peptide in the
absence of a bacterial infection?
Answer:
These receptors were originally identified by their ability to bind N-formyl peptides such as N-formylmethionine produced by the degradation of either bacterial or host cells. Hence formyl peptide receptors are involved in mediating immune cell response to infection.Mark me as brainliest ❤️What is the elevation of point B
Answer: c. Point B has an elevation less than 2750 feet.
Explanation:
The lines drawn on the map are known as contour lines and they are used to measure elevation. Point B is on a river and rivers are only able to flow at a lower elevation than the area around them.
Point B is therefore lower than the area around it and as the closest contour line to it puts the area at an elevation of 2,750 feet, that must mean that Point B is lower than 2,750 feet.
________, a mammalian hormone that also acts as a neurotransmitter in the brain, is released during breast feeding and by contact and warmth.
Answer:
"Oxytocin " is the right answer.
Explanation:
The hormone which is utilized to treat the condition as well as enhance uterine movements or contract or reduce post-birth hemorrhage is determined as Oxytocin.Is therefore considered to have become a driving factor promoting attractiveness and governs all but the most important parts of the reproductive tract as well as birthing.I don’t know the answer
Answer:
found this diagram
Explanation:
:)
What is the approximate age of the ash footprints at Laetoli? (Hint: what is the radiometric age of Laetoli?)
Answer:
The correct answer is - 3.66 million years ago.
Explanation:
Laetoli, located on the Eyasi Plateau which is known for the remains or footprints of the oldest hominin that were formed and preserved by a series of events - a volcanic eruption, a rainstorm, and another ashfall.
The remains and footprints were discovered at 1978 and are attributed to Australopithecus afarensis. The age of this remaining footprint can be estimated with the help of the radiometric method of the remains which tells that the footprints are 3.66 million years ago formed.
Name the process by which sugar moves into cell A.
Name the process by which sugar moves into cell B.
Answer:
need picture brahj, but I got u, when it moves from high concentration to an area of low concentration, a process called diffusion. its process of moving glucose across the cell membrane is called facilitated diffusion.
Explanation:
how many ATP are generated from the ETC and ATP synthesis?
a) 12
b) more than 30
c) 6
d) 5
Answer:
more than 30
Explanation:
Francis was recording plant heights for an experiment. Each time that she took a measurement, she wrote it down. Then,
she measured the plant again and compared the new measurement to the one that she had recorded in her notebook.
What was she most likely trying to do?
revise her hypothesis
check her memory
O make the data more valid
O form a conclusion
Answer:
c make the data more valid
Explanation:
Which statement accurately describes the relationship between weight and
mass?
Answer: An object with twice the mass of another object will weigh twice as much is the statement accurately describes the relationship between mass and weight.
Hope it helps you if not sorry
Explanation: A.Mass is an objects weight multiplied by the amount of gravitational force acting upon the object
66. A 64-year-old woman, who has always been proud of her suntanned, healthy look, is referred to a dermatologist with a blue-violet, painless, 1.5-cm lump in the skin of her left shoulder. The lump is firm and cannot be moved, and has grown very rapidly over the past few weeks. The mass is removed surgically and the pathologist diagnoses it as a Merkel cell carcinoma. If the UV radiation to which her skin was exposed affected the Merkel cells, what other cell type sharing the same specific epidermal layer might also be affected
Answer:
Basal stem cells for keratinocytes
Explanation:
Keratinocytes are epidermal cells located in the outermost layer of the skin (i.e., the epidermis). Moreover, the cells located in the basal layer of the skin are known as basal keratinocytes or basal cells. These basal cells are proliferative cells that undergo differentiation in order to form suprabasal epidermal layers. Merkel cells are neuroendocrine cells that are located in the basal layer of the skin (scattered among basal keratinocytes), which are attached to surrounding keratinocytes by intercellular junctions called desmosomes.
Do you think that tardigrades could hold the key to space travel. Why or Why not?
Answer:Tardigrades have survived exposure to outer space. There are about 1,300 known species in the phylum Tardigrada, a part of the superphylum Ecdysozoa consisting of animals that grow by ecdysis such as arthropods and nematodes.
Consider a neuron in which the Cl- concentration inside of the cell is 15 mM and outside of the cell is 140 mM. Once the ions flow and reach an equilibrium, approximately what will be the concentration of Cl- inside of the cell
Answer:
The correct answer is - negative.
Explanation:
Cl- ion is more concentrated outside of the cell, as it is given 140 and therefore it will try to move to the inside of the given cell as inside ion concentration is low.
At last, the diffusive force will be get to equilibrium due to an electrostatic force pulling Cl- ions back out of the cell. At this equilibrium point, Cl- ions will moved towards to the the neuron and cause the membrane potential to be more negative.
A teacher gave the lab group shown below an "unsafe practice" warning. What is most likely the basis for the teacher's warning?
A food chain consists of several organisms. Suppose one of the organisms in the chain disappears. What effect can this have on the other organisms in the food chain?
Answer:
All organisms in that food chain would starve until they die unless they could possibly move to a different habitat.
Explanation:
And because of all those organisms not being able to properly feed due to an organism missing in the food chain of that habitat, the population of those animals would decrease as well.
What do scientists study to see the genetic changes that occur through generations?
A.Overall appearance
B.Phenotype
C.Genotype
D.The species overall demeanor
Which is not an affect of estrogen in women?
A.Regulates menstruation
B.Regulates egg development
C.Regulates no aspects of pregnancy
D.Regulates egg development and menstruation
What is the winter caused by?
A) indirect sunlight striking Earth
B) Earth's far distance from the sun
C) Earth's closeness to the sun
D) direct sunlight striking Earth
Answer:
A
Explanation:
The distance between the earth and the sun does not affect the seasons.its the tilting of the earth and the planets movement the sun.
I hope it helps
Answer:
Answer is A)
Explanation:
indirect sunlight striking earth
Question 9 of 10
Which elements are in the substance that makes up about 60% of the male
human body?
A. Carbon and phosphorus
B. Phosphorus and nitrogen
C. Hydrogen and oxygen
D. Calcium and oxygen
SUENT
Answer:
the answer would be c. hydrogen and oxygen
__________ commonly cause increased energy and alertness, increased heart rate and respiration, and loss of appetite.
Answer:
Stimulants commonly cause increased energy and alertness, increased heart rate and respiration, and loss of appetite.
If an egg with 22 chromosomes is fertilized by a normal sperm with 23 chromosomes the result is a condition called
Answer: the answer is monosomy
Why doesn't the level of oxygen in the atmosphere decreases'?
Answer:
Oxygen levels are decreasing globally due to fossil-fuel burning. The changesare too small to have an impact on human health, but are of interest to the study of climate change and carbon dioxide.
#CarryOnLearning
Answer:
The atmosphere is constant for many years does not decrease because the green plants which are capable of photosynthesis take up CO2 from the atmosphere and produce 0 2 in return
Which of the following parts of the brain is related to controlling water concentration and Osmosis?
A. Basal Ganglia
B. Thalamus
C. Hypothalamus
D. Pituitary Gland
Answer:
The correct answer is - D.
Explanation:
The pituitary gland is the gland that releases the ADH hormone that helps in reabsorption and regulates the osmoregulation and water concentration in the body. Antidiuretic hormone is an important hormone in water concentration regulation.
Hypothalamus is the part of the brain other than the Pituitary Gland that helps in controlling water concentration and Osmosis by controlling pituitary gland.
The correct answer is - D.Pituitary Gland
what is cell membrane ?
Explanation:
the thin outside layer that surrounds the cytoplasm of a cell and controls the movement of materials into and out of the cell. cell membrane.hope it helps.stay safe healthy and happy....