Answer:
Nerve cells and axons are the way we transmit motor and sensory signals. The cells and axons are coated with myelin a.k.a.(myelin sheath) Myelin allows smooth transition of signals to and from motor and sensory pathways. In multiple sclerosis the myelin sheath is irreversibly damaged. The damage to the myelin interrupts the normally smooth transmission of signals. The damage leads to pins and needles sensations(paresthesias), muscle weakness secondary to poor motor signal transmission, vision is no different as the sensory signal is impeded from transmission secondary to lack of myelin sheath
Explanation:
Answer:
According to the image, the myelin sheath in a person with multiple sclerosis wears away. This damage hampers the ability of the nerve cells to transmit impulses as fast as they can. This inability results in symptoms such as visual disturbances. It also causes chronic, dull pain. These symptoms wouldn’t exist if the myelin sheath were intact. (this is the sample answer they gave me)
Explanation:
What is the PURPOSE of meiosis?
A. to make sperm & egg
B. to make food from sunlight
C. to make new boy cells
D. to make fertilized eggs
Answer:
to make sperm& egg
Explanation:
to make sperm& egg
Chemicals used in chemotherapy treatments to fight cancer can also harm cells in hair follicles and bone marrow.
What characteristic do these cels most likely share with cancerous cells?
O They form tumors.
O They spread through the blood.
• They divide rapidly.
O They contain a mutation.
A
Answer:
They divide rapidly
Explanation:
Some normal cells such as hair follicles cells, mouth cells, digestive tract cells, and bone marrow cells divide rapidly. In mammalians, hair follicle cells are cells localized in the skin, specifically in the dermal layer of the skin. In this region, epidermal cells that form the root of the hair divide rapidly by interacting with neuropeptides, hormones, and immune cells. On the other hand, the bone marrow is a spongy tissue found in bones that contain stem cells (which also divide rapidly). In consequence, it is well-known that high-dose chemotherapy treatments may damage these types of cells.
Which is a requirement for natural selection to occur?
Answer:
so you're going to need natural selection you're going to need reproduction h e r e d i t y variation and fitness or orgasms variation in individual characters among the members of the population if they are met in natural selection automatic results
Answer:
A heritable variations for some traits
HURRY RUNNING OUT OF TIME FIRST CORRECT ANSWER GETS A CROWN
Purple flowers are dominant over white flowers. The parent generation includes two heterozygous parents.
What are the possible phenotypes of these parents’ offspring?
3 purple and 1 white
3 white and 1 purple
1 purple, 2 lilac, and 1 white
1 white, 2 speckled, 1 purple
Answer:
3 purple and 1 white (i think)
Answer:
3 purple and 1 white.
Explanation: Took the exam, got 100
1. What is Ecology?
a. The study of Earth's Mantle
b. The study of relationships between living things and their environment
C. The study of humans and their impact on Earth
d. The study of plants
Answer:
B. The study of relationships between living things and their environment
Explanation:
while mutation is random, natural selection is not. In your own words, explain how this is possible
Answer:
Mutation is a alteration in the DNA sequence in a gene during cell divison iwhere gene is coded mitakeny or due to the error. Mutatio is a random process as it can not be determind or known befor bthechange in sequence what gene or DNA would be effected by it or what genes would be transfer from the parents.
Natural selection is a process where some of the traits that are helpful in the surviving and increasing the number of individuals in a population and transfer from one generation to other according the adaption and change over the long timeline. Thus, it is not random and based on the traits that are helpful in a environment or for the survival of
How many genders are there?
Answer:
2 only
Explanation:
Answer:
there are 2 genders: the male and female
I need help please?!!!!!
Answer:
a Bicycle and Skateboard
A _____ is the structure that contains the DNA of the cell.
A. Vacuole
B. Chromosome
C. Centromere
D. Centrosome
E. Centriole
The answer is chromosome
The chromosome is densly packed DNA.
Which of the following engulfs pathogens or an invading virus or bacteria
-t cell
-b cell
-macrophage
-red blood cell
Answer:
Macrophage
Explanation:
They do this through a process called phagocytosis
The following engulfs pathogens or an invading virus or bacteria - macrophage.
Macrophagea type of white blood cell of the immune systemengulfs and digests pathogens, an invading virus or bacteriait recognizes anything that does not have, on its surface, proteins that are specific to healthy body cells.surrounds and kills microorganisms, removes dead cells, and stimulates the action of other immune system cells.Thus, The following engulfs pathogens or an invading virus or bacteria - macrophage.
Learn more:
https://brainly.com/question/1474358
What of the following happens first?
Answer:
you should give options too
Answer:
it is c
Explanation:
because it is scientificly proven
Drag each tile to the correct box.
Sort the types of energy according to the order in which they move through this system:
Water stored in dams falls freely with the force to make a turbine move. The turbine moves and produces electricity. This electric energy is
supplied to homes. At home, we use electricity for heating, cooling, and lighting.
Put these in order:
Electrical energy
Light energy
Potential energy
Kinetic energy
Answer:
Electrical energy > kinetic energy > light energy > potential energy
Explanation:
How is the space shuttle able to leave earth's surface?
PLEASE TELL ME IS ITS A, B, C, OR D
Answer: A
Explanation:
The shuttle needs to go up in order to get into space, this means they need to create a force greater then gravity because if they didn’t the shuttle wouldn’t be able to accelerate upwards
The space shuttle is able to leave Earth's surface when the space shuttle engine creates an upward force that is greater than downward force of gravity.
The force of gravity pulls every towards the center of the Earth, to overcome this force of gravity the space shuttle will create an upward force that is greater than force of gravity.
The upward force created by the space shuttle engine must overcome the downward force of gravity on the space shuttle.
To overcome the force of gravity, the space shuttle engine speeds upwards with a velocity known as escape velocity.
Thus, we can conclude that the space shuttle is able to leave Earth's surface when the space shuttle engine creates an upward force that is greater than downward force of gravity.
Learn more about escape velocity here:https://brainly.com/question/24145520
Has plasticity allowing this layer to be flexible
A. Asthenosphere
B. Mantle
C. Lithosphere
D. Inner core
Answer:
C?
Explanation:
Mitosis division occurs in.....????
-prokaryote
-body cell
-all of the mentioned
-sex cell
Cellular respiration is the chemical basis of how cells release energy from foods. When you eat an apple, your cells extract energy. The text below explains how cells use cellular respiration to extract energy from an apple. Choose the parts of the sentence that are incorrect.
The apple first enters the digestive tract through the mouth, where digestion begins with chewing. Enzymes begin to break down the apple in the mouth. From the digestive tract, the glucose from the digested apple is absorbed into the bloodstream, where it is brought to cells throughout the body. In the chloroplast, the glucose begins cellular respiration. The molecules react with carbon dioxide to release energy. Oxygen is produced as waste
Answer:
chloroplast is def wrong
Explanation:
it is mitochondria
What is the correct definition of a gene?
Protists are grouped together because they all look similar.
True
False
Answer:
True
Explanation:
1. Nitrogen fixation: Nitrogen fixation occurs when (a) ___________ converts N2 gas into (b) _________________________ that living things can take up.
2. Ammonification: In this step, bacteria in soil or fungi will convert nitrogen into _____________________________
3. Nitrification: A 2-step process:
Step 1: Soil bacteria converts (a)_______________________ into (b)___________________
Step 2: Soil bacteria then convert nitrite ions into (c)_____________________________
4. Denitrification: In this process (a)__________________________ are converted to (b)_________________ gas, which are then released to the atmosphere.
5. Assimilation: This occurs when ___________________________________________.
Answer:
Nitrogen fixation occur when nitrogenase convert N2 into ammonia gas that living thing can take up.
Ammonification bacteria in soil or fungi will convert nitrogen into ammonia compound.
3. Nitrification.
Soil bacteria converts ammonia to nitrite.
Soil bacteria then convert nitrite ions into nitrate.
4. Denitrification in this process , nitrate is converted to nitrogen gas, which are then released to the atmosphere
Assimilation occurs when minerals and vitamins are absorbed in the food by the intestine.
Explanation:
Nitrogen fixation is the process where nitrogen is fixed and made available by living things in which nitrogenase convert nitrogen to ammonia.
Ammonification is the process by which organic nitrogen is converted to ammonia compounds by bacteria and fungi
Nitrification is the process where nitrifying bacteria convert ammonia to nitrite and then nitrite to nitrate.
Denitrification is the process where nitrate is reduced or converted to nitrogen gas.
Assimilation is the process of absorbing vitamins and minerals from food by the intestine.
You can tell the age of a skeleton by looking at:
O1) the length of the femur
O2) the shape of the pelvis
O 3) the number of fused bones
O4) the color of the bones
Answer:
Calculating the age of a skeleton can be done by looking at the number of fused bones (option 3).
Explanation:
The calculation of skeleton bone age takes into account the complete ossification of bones, which occurs at various stages of human development.
In childhood, the epiphyses or ends of long bones are not completely ossified but are formed by cartilage, due to the process of growth. When development is achieved, the growth nuclei and cartilage disappear.
Bone age is a reliable parameter for calculating chronological age, as they are quite approximate.
The other options are not correct because:
1. The length of the femur is useful for calculating height.
2. The shape of the pelvis helps to differentiate the sex.
4. The color of the bones is not a useful parameter to calculate the age of the skeleton.
what molecules from proteins when linked together with covalent bonds
Answer:
Amino Acids
Explanation:
they link with each other through means of peptide bonds and as a result form proteins
Which of the following serves as the cell's boundary from its environment
and controls what goes in and out of the cell? *
O Mitochondria
O Cell membrane
O Chloroplast
Golgi Apparatus
Year after year, Xavier raises a vegetable garden in the same plot of soil. He observes that the plants grow less abundantly from one year to the next, and they produce fewer vegetables. Which of these processes could help explain Xavier's observations?
A. the rate at which soil bacteria perform photosynthesis
B. the rate at which soil bacteria perform denitrification
C. the rate at which soil bacteria perform nitrogen fixation
D. the rate at which soil bacteria perform chemosythesis
Answer:
C. The rate at which soil bacteria perform nitrogen fixation
Explanation:
Since Xavier is raising vegetables in the same spot year after year it is reasonable to expect that the plants would deplete the soil of its resources. Since the soil doesn't have enough minerals and not enough time for the bacteria to perform nitrogen fixation the plants don't grow at the same rate and numbers that they used to at the beginning.
Explain in your own words (as if describing to me) how convection works to move plates.
Answer:
Tremendous heat and pressure within the earth cause the hot magma to flow in convection currents. These currents cause the movement of the tectonic plates that make up the earth's crust
Explanation:
if some can help me with my biology final the whole 25
Answer:
add the answers if you dont know
Explanation:
Answer:
KC is looking at cells in biology class, but he doesn't know where they came from. He sees that the cells under his microscope have cell walls and chloroplasts. Therefore, KC is likely observing cell from:
A leaf that got blown onto the floor.
Plant cells are the only cells w/ chloroplast!
Explanation:
pick me as the brainliest
According to scientists, all of the bodies in the universe came from a rotating cloud of gases and dust about
billion years ago.
O 3.5
O 2.5
O 4.5
O 1.2
It's either 3.5 or 1.2
There would be more evidence spread out through space to be noticed by scientists and it seems like a stretch to go as far back as 4 billion years ago.
(I mean really? That much before the DINOSOURS died? I don't think so)
◕‿◕
Hope this helps
Miri
If an organism is said to reproduce asexually, how would the offspring resemble the parent organism?
Answer:
It would resemble it through its genetic features.
Explanation:
Answer: Asexual reproduction produces offspring that are genetically identical to the parent, whereas sexual reproduction produces a similar, but genetically unique offspring. In sexual reproduction, meiosis produces haploid gametes that fuse during fertilization to produce a diploid zygote (Figure below).
Explanation:
Organisms that complete the final breakdown and recycling of organic materials from
the remains of all organisms are the
detritivores
omnivores
decomposers
O carnivores
Answer:
decomposers
Explanation:
These are heterotrophic organisms that feed on dead animals and plants, secretions, or discarded parts of living beings, that is, organic matter.
And they break it down into inorganic.
Thus, inorganic substances that can be reused in the process of photosynthesis are returned, recycled, to nature.
How old do paleontologist believe the earth is?
Answer:
Scientists now know the Earth is actually 4.54 billion years old, an age built on many lines of evidence from the geologic record.
Explanation:
research on obesity rates and genetically based skin color illustrate different types of biological change because
Explanation:
research on obesity rates and genetically based skin color illustrate different types of biological change because obesity rates demonstrate an evoked cultural response; genetically based skin color does not.
