Answer:
A typical neuron consists of a cell body (soma), dendrites, and a single axon. The soma is usually compact. The axon and dendrites are filaments that extrude from it. Dendrites typically branch profusely and extend a few hundred micrometers from the soma. The axon leaves the soma at a swelling called the axon hillock (the axon hillock also has the greatest density of voltage-dependent sodium channels. This makes it the most easily excited part of the neuron and the spike initiation zone for the axon) and it branches but usually maintains a constant diameter. At the farthest tip of the axon's branches are axon terminals, where the neuron can transmit a signal across the synapse to another cell.
In general, dendrites receive the electrical signal from other neurons, and this signal is transmitted over long distances from the axon.
Like all animal cells, the cell body of every neuron is enclosed by a plasma membrane, a bilayer of lipid molecules with many types of protein structures embedded in it. A lipid bilayer is a powerful electrical insulator, but in neurons, many of the protein structures embedded in the membrane are electrically active. These include ion channels that permit electrically charged ions to flow across the membrane and ion pumps that chemically transport ions from one side of the membrane to the other to generate the action potential that generates the electrical signal. They also have a highly developed synthetic apparatus for the production of neurotransmitters
Compare and contrast chemical weather by water
and by oxygen. How are they similar and how are
they different?
Answer:
Physical and chemical weathering often happen at the same time, but the ... Water that freezes in cracks and forms ice, salt from evaporated seawater, ... For example, the rocks on a riverbed smooth each other because they collide in the current. ... Oxidation is the reaction of oxygen with chemicals in a rock.
Explanation:
Which is the last structure to contact sperm before it leaves the body?
penis
sperm duct
testes
urinary bladder
Answer:
A is correct
Explanation:
Urinary bladder is the last structure to contact sperm before it leaves the body.
What are the functions of urinary bladder?The urinary bladder, or simply bladder, is a hollow organ in humans and other vertebrates that stores urine from the kidneys before disposal by urination. In humans the bladder is a distensible organ that sits on the pelvic floor.
The urine formed by the nephrons of the kidneys is transported to the urinary bladder for storage before it gets expelled through the urethra. The urinary bladder is a sac that serves as a reservoir for urine.
The urinary bladder is a temporary storage reservoir for urine. It is located in the pelvic cavity, posterior to the symphysis pubis, and below the parietal peritoneum. The size and shape of the urinary bladder varies with the amount of urine it contains and with the pressure.
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12. Grassland biomes have all of the following EXCEPT ______
A. grass for grazing animals
B. wet season
C. slight temperature range D. wheat fields
13. Deserts have all of the following EXCEPT
A. little rainfall
B. little wind
C. soil with little organic matter D. few large animals
Answer:
12. C. slight temperature range
13. B. little wind
Explanation:
Grassland biomes do not have a slight temperature range, they have a large one. It could be very hot in the day time but then quite cold at night.
Deserts do not have little winds blowing across them. These winds are usually strong and dry. The sand dunes in deserts were formed by these winds as they pick up sand particles and carry it to another area.
A basic plant cell is shown.
Plant Cell
X
KEY
W-Vacuole
X-Nucleus
Y-Mitochondrion
z-Chloroplast
w
-Z
Which organelle stores hereditary material and coordinates the activities of the cell?
Organelle W
Organelle X
Organelle Y
Organelle z
Answer:
organelle X
Explanation:
the nucleus controls all activities carried out by the cell
What is the weather currently like in northwestern North Dakota?
!!!!! HELPPPPPP!!!!!
Answer:
Right now it is 42°F
(Is this what you are asking?)
4.1. Write down 3 ideas for how you can make new
friends.
4.1.1.
4.1.2.
4.3
Answer:
1) go up to someone. 2)(if ur in school) go up and ask them if they're in one of ur classes. 3)build a conversation from there.
Which statement is true regarding nuclear power plants
Viruses are often confused with living things. This is because
Viruses are composed of proteins and genetic material; they maintain
homeostasis
Viruses are composed of proteins and genetic material; they possess the ability
to produce proteins
O Viruses are composed of proteins and genetic material; they possess a
metabolism and ability to produce proteins
Viruses are composed of proteins and genetic material; and may be classified
(sorted) by their amino acid sequences
Answer:
*
Explanation:
A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. Viruses infect all types of life forms, from animals and plants to microorganisms, including bacteria and archaea
Mendel is considered the Father of Genetics. His famous pea plant experiments helped to formulate several laws in genetics that have
stood the test of time with very little modification. Match each law or term with the correct description/definition.
Answer:
The Principles Of Mendel's Genetics
1.Law of Segregation
2.Law of independent assortment
3.Law of dominance
4.Recessive Allele
5.Co-dominance
6.Incomplete Dominance
Explanation:
The Law of Segregation, often known as Mendel's First Law, stipulates that two alleles for a trait segregate during the production of gametes, resulting in each gamete having just one copy of each allele.
What is an explanation of the concept ?This concept explains why a cross between two animals with dissimilar features, such as flower colour, can occasionally result in an intermediate phenotype in the progeny.
Mendel's Second Law, or the Law of Independent Assortment, states that the inheritance of one feature is not reliant upon the inheritance of another trait. This concept explains why a cross between two animals with dissimilar features can result in offspring that exhibits every feasible combination of the two qualities.
Mendel's research with pea plants was groundbreaking in thea branch of genetics. His thorough research and tests resulted in the development of two laws that are now the cornerstones of genetics. According to the Law of Segregation, two alleles for a trait separate from one another throughout the development of gametes, leaving just one allele per trait in each gamete.
This concept explains why a cross between two animals with dissimilar features, such as flower colour, can occasionally result in an intermediate phenotype in the progeny.
According to the Law of Independent Assortment, one trait's inheritance is not correlated with that of another. This law explains how a cross between two creatures with distinct features can result in offspring that can display any combination of the traits.
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anyone down to be friends? :3
Answer:
sure , me :)
Explanation:
IS MY FINAL EXAM I NEED HELP!
The base pairs in a DNA strand are held together with hydrogen bonds. In what way would a cell be most affected if these were covalent bonds Instead?
A) The cell would need to make new DNA each time the strand was opened
B) The cell would only be able to open and close the DNA strand when it replicated.
C)The would have to take in and use more energy in order to break the covalent bonds.
D)The cell would need to replace the nitrogenous bases each time the DNA strand opened.d
Answer:
I think C)The would have to take in and use more energy in order to break the covalent bonds.
Explanation:
Since hydrogen bonds are weaker than covalent bonds.
PLEASE HELP ASAP
In patients infected with nonresistant strains of the tuberculosis bacterium, antibiotics can relieve symptoms in a few weeks. However, it takes much longer to halt the infection, and patients may discontinue treatment while bacteria are still present. How could this result in the evolution of drug-resistant pathogens?
The bacteria are still present and may obtain antibiotic resistance to spread to other species by horizontal gene transfer.
Antibiotics have become diluted and weak because of a limited supply.
Bacteria have purposefully directed their immune system to resist the effect of the antibiotic.
Resistant bacteria are polyploidy and can resist the antibiotic, a trait that is passed on to their offspring.
Answer:
The bacteria are still present and may obtain antibiotic resistance to spread to other species by horizontal gene transfer.
When a new viral infection appears in a population,scientists usually try to develop a vaccine against the virus. Which substances would most likely be contained in the new vaccin
Answer:
Antigen, stabilizers, surfactants, diluents, preservatives
Explanation:
Antigen: This is part of the protein structure virus or part of its genetic material. These parts are active. But sometimes, the inactivated form of the virus is also included in the vaccine. Stabilizers: Avoid other chemical reactions occurring in the interior of the vaccine. Surfactants: They prevent the occurrence of sedimentation and agglutination of the elements inside the vaccine. Diluent: Used to dilute the vaccine in an appropriate concentration before being used. Preservatives: As the word says, preservatives avoid any possible contamination of the vaccine. These elements´ use depends on the doses prepared. If it is only for one-person use, then they are not needed. But if the doses are to be used by more than one person, they need preservatives because once the vaccine is opened it is vulnerable to contamination.
In guinea pigs, short fur (S) is dominant to long fur (s). Two heterozygous guinea pigs
(Ss) mate. Complete the Punnett square and then list the percentages of the
expected genotypes for their offspring.
Explanation:
A way I like to remember heterozygous is by remembering that the other word for heterozygous because brainly wont let me say it apparently. The same gender liking each other, so (word) is same, hetero is different.
each square would have 25% each because 100%÷4=25.
Dominant one is like mixing black and blue together,the black is gonna give a dark effect to blue so black is dominant.
Blue is recessive.
The percentage of the Ss is 75% while the percentage of the ss is only 25%.
Performing a crossGiven that we have the genotypes of the both parents as Ss. The Ss imples that the gene for short fur is dominant over the gene for long fur.
Now, when we perform te cross for the first generation, we will discover that we have the offspring; Ss, Ss, Ss and ss. The percentage of the Ss is 75% while the percentage of the ss is only 25%.
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Explain the difference between sexual reproduction and asexual reproduction. Explain either an advantage or disadvantage for
each.
In asexual reproduction, reproductive organs aren't used but they're used.
advantage of sexual- A lot of genetic variation. since they have DNA of two parents. they can survive more and adapt more.
disadvantage of asexual- diversity is limited. Since the organism only gets the DNA of one parent, they wouldn't be able to really survive if something happened.They would easily be extinct.
Sorry I can't really cone up with better words but I hope you get the idea. it all comes down to natural selection really if you've learned about it. Hope it helped!!!
please someone do this, i hate biology :(
Answer:
C - Natural selection is causing larger bird beaks.
E - Because the seed hardness has increased the birds need bigger beaks to crack them.
R - This means the birds with larger beaks are not able to crack the seeds, this causes starvation and the birds that have small beaks die as a result. However, birds with larger beaks are able to crack the seeds and eat. Those birds can then reproduce and produce more birds with larger beaks. So the population of large bird beaks has increased, but the population of small bird beaks has decreased.
Humans have between 20,000 and 25,000 functional genes. Alleles are different versions of the same gene. How do you think these different versions of the genes occurred?
Answer:
the many reproduction events
Explanation:
because when there has been many different generations they get more and more genes
How do you think most of the CO2 got into the plants?
Can someone please solve this for me?
A dodder plant wraps itself around a potato plant. The dodder then uses its root system to obtain water and Nutrients from the potato plant
Answer: The question is not complete, here are the options.
Which statements best describe this scenario? Check all that apply.
A. The potato plant is parasitic.
B. The dodder plant is parasitic.
C. The potato plant will grow stronger.
D.The potato plant stays alive because of
E. The dodder plant stays alive because of the potato plant.
The correct options are A and E.
Explanation:
This is because dodder plant is a parasitic plants that survive and live on the host plants there by causing harm or destroying the host because it survive on the resources needed for the host survival. Dodder plants twine around the potatoes and obtain nutrients and water from the potatoes through it root system.
Answer:
The potato plant is parasitic.
Explanation:
taking the unit test rn
If sodium (Na) bonds with Chlorine (Cl), which statement is true?
Group of answer choices
An electron is shared between sodium and chlorine and a covalent band is formed
An electron is transferred from sodium to chlorine and an ionic bond is formed
An electron is transferred from chlorine to sodium and an ionic bond is formed
An electron is transferred from sodium to chlorine and a covalent bond is formed
Answer:
2
Explanation:
if sodium bonds with chlorine ionic bond formed
Which sediment has the greatest permeability?
Jena is doing research on one of the planets of the solar system. She writes:
"This planet quickly revolves around the Sun and has no rings and no moons. It is also the planet that has virtually no atmosphere.”
Based on information provided in Jena’s research, answer the following questions.
1) Is this planet an inner planet or outer planet? Answer: ______
2) What is the composition of this planet?
Answer: ______
3) What is the identity of this planet?
Answer: ______
Answer:
1) Inner
2) Solid rock
3) Mercury
Explanation:
Mercury has no atmosphere since it is so close to the sun, the inner-most planet, and it is solid and non-gaseous. Hope this helps you!
26. What about the structure of a fat molecule makes it useful for a cell and why?
The large number of carbon-hydrogen bonds allow for the storage of energy.
Fats serve as enzymes in the process of digestion.
The glycerol portion of the fat molecule is used to release energy
The fatty acid part of fats help digest food in cellular respiration.
the large number of carbon-hydrogen bonds allow for the storage of energy
The structure of a fat molecule makes it useful for a cell, and a large number of carbon-hydrogen bonds allows for the storage of energy. The correct option is a.
What is the structure of fat?A glycerol backbone and three fatty acid tails make up the two types of components that make up a fat molecule. It contains a glycerol molecule and is a little chemical molecule. Where the hydroxyl group occurs in the groups, there are three fatty acid tails.
They have a long hydrocarbon chain since that is what they are. This particular long hydrocarbon chain has a carboxyl group or oxy group attached due to the abundance of carbon-hydrogen bonds.
Energy can be stored in it. On the structure, it is excellent for storing energy. Energy can be stored in a specific structure.
Therefore, the correct option is a. Numerous carbon-hydrogen bonds to allow for the storage of energy.
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Practice 1: Choose all the answer choices that represent the use of trees,
A Heat to cook food
В. Lumber to build homes
C. Materials to make tools
D .Fire to warm homes
Answer:
bc
Explanation:
trust mate i got an a plus i think or a normal a
USING THE ORGANELLES NUCELEUS, CHROMOSOMES, AND CELL MEMBRANE ANSWER THE FOLLOWING BELOW PLEASE!!!!!
Answer:
Jason, i don't have much time because I'm very tired and i have to go to bed but this a good example of homeostasis.
Imagine that the cell is exposed to some kind of stressor such as extremes of temperature, exposure to toxins, or mechanical damage. The chain reactions will be
Disruption or the formation of cell membrane blebsAlteration of protein synthesis and accumulation of altered proteins in the ERAlteration of the chromatin of the chromosomes inside the nucleus and DNA damageAlteration of the permeability of organelles such as mitochondria with consequent alterations in metabolismDecrease in ATP levels and increase in cytoplasmic calcium levelThe combination of all this can lead the cell to death but it can respond in various ways:
the cell can decrease protein synthesis and induce the transcription of specific stress-sensitive chromosomal genes that correct altered proteinsIt can respond to DNA damage by stopping replication and trying to repair it If it cannot survive it can commit suifcide so as not to harm other cellsThe organism used in bread making is?
(a) Yeast
(b) Aspergillus
(c) Mushroom
(d) Rhizobium
Answer:
Yeast is used in bread making
1. Mutations are always transmitted to the offspring.
Select one:
True
False
2. Mutations are only caused by errors in DNA replication.
Select one:
True
False
true true...... .......
Bacteria are used in food industry for the production of ?
(a)curd
(b)cheese
(c)butter
(d)all of the above
Answer:
D.) All of the above
Explanation:
Bacteria has become a major component in the processing of dairy products because of various factors. The distribution of bacteria aids factors like ripening and flavor development of cheese and curd and also aids fermentation.
Curd, cheese and butter production all involve the use of bacteria.
The bacteria commonly used to make curd is lactobacillus bacteria.
The bacteria commonly used to make cheese are lactococcus, lactobacillus and streptococcus genera
The bacteria commonly used to make butter are lactococcus and leuconostoc .
1. Why does the moon go through Phases?
I
2. Why do we experience solar and lunar eclipses?
3. What is the underlying reason the Earth goes through
Seasons?
Explanation:
1.The Moon has phases because it orbits Earth, which causes the portion we see illuminated to change. The Moon takes 27.3 days to orbit Earth, but the lunar phase cycle (from new Moon to new Moon) is 29.5 days. The Moon spends the extra 2.2 days "catching up" because Earth travels about 45 million miles around the Sun during the time the Moon completes one orbit around Earth.
2.
An eclipse is the result of the total or partial masking of a celestial body by another along an observer's line of sight. Solar eclipses result from the Moon blocking the Sun relative to the Earth; thus Earth, Moon and Sun all lie on a line. Lunar eclipses work the same way in a different order: Moon, Earth and Sun all on a line. In this case the Earth's shadow hides the Moon from view.Lunar and solar eclipses occur with about equal frequency. Lunar eclipses are more widely visible because Earth casts a much larger shadow on the Moon during a lunar eclipse than the Moon casts on Earth during a solar eclipse. As a result, you are more likely to see a lunar eclipse than a solar eclipse.
3.Why Do We have Seasons?
As the earth spins on its axis, producing night and day, it also moves about the sun in an elliptical (elongated circle) orbit that requires about 365 1/4 days to complete. The earth's spin axis is tilted with respect to its orbital plane. This is what causes the seasons. When the earth's axis points towards the sun, it is summer for that hemisphere. When the earth's axis points away, winter can be expected. Since the tilt of the axis is 23 1/2 degrees, the North Pole never points directly at the Sun, but on the summer solstice it points as close as it can, and on the winter solstice as far as it can.
Why Do the Seasons Change on Earth?
Two things cause the seasons to change. First, the Earth moves around the Sun. Second, the Earth has a tilted axis of rotation.
The Earth spins around an axis. This imaginary line extends from the South Pole to the North Pole. But the Earth’s axis is not vertical. It’s actually tilted at an angle of 23.5°. The planet is always tilted in the same direction as it orbits the Sun.