Answer:
that's very broad, is that the whole question?
Answer:
A major influenece is the wide and used fossil fuels
Why are surface antigens on sperm cells not recognized as “self,” and why do they require a blood-testis barrier to prevent antibody formation?
Answer: Sperm cells are recognised as foreign cells by the immune system and requires blood testis barrier to prevent antibody formation.
Explanation:
Shortly after birth, the immune system of an individual starts to recognize the surface antigens of its body cells as 'self' and avoids forming an antibody against it. Spermatozoa (sperm cells) are formed at puberty, between the age of 10 and 14. Hence, the body immune system will recognise the antigen on the sperm cells as 'non-self' and stimulate antibodies against it. This is prevented by the blood testis barrier.
The blood testis barrier which are formed from the Sertoli cells at the seminiferous tubules helps in the isolation of the sperm cells and protects it from immune surveillance. This barrier also prevents sperm cells from coming in contact with blood.
Sperm cells formed during puberty hence immune system recognize them as non-self. Immune attack is prevented by the blood-testis barrier.
Blood-testis barrier:
It is the barrier that is made from the Sertoli cells in the seminiferous tubule. This helps to isolate the sperm cells from the immune surveillance. This also protects sperm cells to come in contact with blood.
Sperm cells formed during puberty hence immune system recognize them as 'non-self'.
Therefore, Sperm cells formed during puberty hence immune system recognize them as non-self. Immune attack is prevented by the blood-testis barrier.
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describe what happens final stage of cell devision
Answer:
Cytokinesis takes place.
Explanation:
Cytokinesis is when cytoplasmic separation of cells at the end of mitosis or meiosis, which results in division into two daughter cells.
-
Which type of cell division is shown in the diagram above?
meiosis because it results in haploid cells
meiosis because it involves one parent cell
o
mitosis because the daughter cells are identical
mitosis because the daughter cells are not identical
Answer:
:^6⁶⁶
Explanation:
Answer:
There is no diagram
Explanation:
Name the parts of an Action Potential and include the Ions that are responsible for an Action Potential.
Answer:
The action potential has three main stages: depolarization, repolarization, and hyperpolarization. Depolarization is caused when positively charged sodium ions rush into a neuron with the opening of voltage-gated sodium channels.
Explanation:
plss anyone wanna Help?
Answer:
M is the answer
Explanation:
It is a fact that cells come from preexisting cells.
James wants to know which brand of shoe will help him run faster. He thinks the more expensive shoe should be the one that helps him run faster. He tries three different types of running shoes. He runs one lap on the track with pair of shoes ( shoe A) and times how long it takes. He rests for 15 minutes. Then, he tries on another of shoes (shoe B) and runs a lap around the track, while timing how long it takes. He rests for 15 minutes before repeating the lap with the last brand of shoes (shoe C). Which type of investigation did he plete ?
Answer: shoe c
Explanation: shoe c he ran 3 laps in total
Altering the DNA of an organism in order to get the traits we want is
called
A.Human Genome
B.Genetic Engineering
C.Inbreeding
Need help with this assignment, thanks!
Answer:
.
Explanation:
Which among the following options is a disorder in the environment?
a. A basket of unwashed dirty clothes b. A house with no single plant
c. A garden with dying plants d. A library with a small number of books
Answer:
B. A house with no single plant
A garden with dying plants is a disorder in the environment (Option c).
Homeostasis refers to the biological processes by which organisms maintain a state of internal equilibrium independent of the environment's state (i.e. their internal conditions are relatively stable).
In biology, the disorder is associated with a lack of homeostasis.
In plants, disorders are associated with different non-pathological conditions (e.g., lack of macronutrients, poor light conditions, etc). These environmental conditions may lead to the death of the plant.
In conclusion, a garden with dying plants is a disorder in the environment (Option c).
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Which of the following choices includes two structures that are found in plant cells, but not in animal cells?
chloroplasts, ribosomes
A.lysosomes, mitochondria
B.cell wall, nucleus
C. cell wall. large central vacuole help pls
Answer:
C.
Explanation:
James wants to know which brand of shoe will help him run faster. He thinks the more expensive shoe should be the one that helps him run faster. He tries three different types of running shoes. He runs one lap on the track with one pair of shoes (shoe A) and times
how long it takes. He rests for 15 minutes. Then, he tries on another pair of shoes (shoe B) and runs a lap around the track, while timing how long it takes. He rests for 15 minutes before repeating the lap with the last brand of shoes (shoe C).
Which type of data did he collect?
a.)observational data
b.)qualitative data
c.)quantitative data
d.)experimental data
Answer:
Quantitative date if you do a chart. But sometimes people do it in the way of experimental data. So I would say quantitative
Explanation:
what effect do carbon dioxide and methane have on earths temperature
Answer:
create the heat-reflective layer that keeps the Earth at a livable temperature
Explanation:
PLEASE HELP!! WILL MARK BRAINLIST!!!!!!
Two factors that affect human sleep patterns are the time of day and level of melatonin, a chemical found in one's body. For example, as the Sun goes down at night, the body knows it is time to go to sleep. Similarly, when a person's level of melatonin changes, they can become alert or sleepy. Using this information, how could these stimuli be described?
A. Hours of sunlight per day and melatonin levels are both Internal stimuli.
B. Hours of sunlight per day and melatonin levels are both external stimull.
C. Hours of sunlight per day is an external stimulus, while the level of melatonin in a person is an internal stimulus.
D. Hours of sunlight per day is an internal stimulus, while the level of melatonin in a person is an external stimulus.
E. Hours of sunlight per day and melatonin levels are both internal and external stimuli.
Answer:
C. Hours of sunlight per day is an external stimulus, while the level of melatonin in a person is an internal stimulus.
Explanation:
Melatonin is a hormone therefore internal. Sunlight is outside of the body therefore external
What is the term used to describe the energy of moving particles
Answer:
Kinetic energy
Explanation:
Because the particles are moving, they have kinetic energy. The faster they move, the more kinetic energy they have. When an object is hot, the particles move faster.
A particular species of lizard has become extinct. Which of these is not a factor that could have led to its extinction?
A.
habitat destruction by humans
B.
adverse climate conditions
C.
competition for food resources
D.
increased genetic variation
Answer:
d. increased genetic variation
Explanation:
Hormones. classification according their biological effects
Answer:
Hormones can be classified according to their chemical nature, mechanism of action, nature of action, their effects, and stimulation of Endocrine glands. i. This category of hormones are divided to six classes, they are hormones steroid; amines; peptide; protein; glycoprotein and eicosanoid.
Explanation:
Compare and contrast the main characteristics of the alpine and taiga biomes.
Answer:
Both the alpine and taiga biomes have two distinct seasons. The alpine biome is found on five of the seven continents, while the taiga biome is found on three. The alpine biome gets an average of 12 inches of precipitation annually and the taiga biome gets an average of 12-33 inches annually. Both the alpine and taiga biomes have cold winters with temperatures below freezing and warmer summers. The taiga biome has a greater average temperature range in the summer than does the alpine biome.
Explanation:
There are two separate seasons in both the taiga and alpine biomes. Taiga biomes are only present on three of the seven continents, compared to five for alpine biomes.
What are alpine and taiga biomes?Precipitation averages 12 inches per year for the alpine biome and 12 to 33 inches per year for the taiga ecosystem. Both the alpine and taiga biomes have warmer summers and extremely harsh winters with temperatures below zero.
Similar to the tundra, the taiga has extremely chilly weather. Additionally, it experiences extremely long winters and incredibly brief, warm summers. Although it doesn't get much rain, it usually gets more than the tundra. However, the soil is still very deficient.
Conifers make up the majority of the local life. Because of their cone form, which allows snow to fall off of them, their dark hue, which allows them to absorb thermal energy, and their needles, which help minimize water loss, conifers do well in this habitat.
Therefore, There are two separate seasons in both the taiga and alpine biomes. Taiga biomes are only present on three of the seven continents, compared to five for alpine biomes.
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Earth systems include the biosphere, atmosphere, and geosphere. Use the model to explain how photosynthesis acts to transfer carbon between two Earth systems.
Answer:
It includes two earth system - the biosphere and the atmosphere.
Explanation:
The carbon cycle is the cycle or series of actions that move the carbon through various earth systems. The recycling of the carbon in the pathway includes the biosphere which interacts with the atmosphere as it pulls and releases the carbon in the form of carbon dioxide by two cellular processes known as photosynthesis (only in algae and plants) and cellular respiration.
Photosynthesis is the process that pulls the carbon dioxide for the production of sugar and oxygen with the help of light energy in plants (biosphere) from the atmosphere.
Photosynthesis helps to transfer carbon to the biosphere and the atmosphere.
It should be noted that the carbon cycle refers to the cycle that moves carbon through various earth systems. Photosynthesis helps to transfer carbon to the biosphere and the atmosphere.
Also, the recycling of the carbon in the pathway includes the biosphere where carbon is released in the form of carbon dioxide through photosynthesis and cellular respiration. Photosynthesis pulls the carbon dioxide for the production of sugar and oxygen.
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Help pls i rlly need it?
Answer:
C cell membrane
Explanation:
identify organelles in an animal cell
A. nucleus, ribosomes, lysosome
B. ribosomes, centriole, lysosome
C. ribosomes, centriole, lysosome
D. mitochondria, centriole, chloroplast
A is nucleus
B is lysosome
C is centrioles
D is cytoplasm
Answer:
D. mitochondria
Explanation:
The sodium‐potassium ion pump found in some cell membranes is made of basic structural components?
Answer:
amino acids
Explanation:
(if you are confused, I recommend watching the videos from Khan Academy and The Amoeba Sisters.)
The sodium-potassium ion pump found in some cell membranes is made of amino acids.
What is a sodium potassium pump?It is a protein that is found in many cells. It keeps the intercellular concentration of potassium ions [K+] greater than the surrounding medium while keeping the internal concentration of sodium ions lower than the surrounding.
What is its function?Its main function is to maintain the membrane potential of the cell. It also maintains osmotic equilibrium.
What is it composed of?It is a protein and is composed of amino acids.
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The part of Earth that is liquid water is called the
Answer:
Hydrosphere
Explanation:
The wording is quite confusing but if you are talking about the 'spheres' of earth's bio-systems, then the answer should be: The part of Earth that is liquid water is called the Hydrosphere
Which planet(s) in the solar system has/have retrograde orbits around the Sun?
Answer:
As viewed from a position in space north of the solar system (from some great distance above the Earth's North Pole), all the major planets revolve counterclockwise around the Sun, and all but Venus and Uranus rotate counterclockwise on their own axes; these two, therefore, have retrograde rotation.
Explanation:
got it from google hope it helps
Answer Choices:
O Earth, Mars, and Saturn
● Venus and Uranus
O Uranus
O Jupiter
Explanation:
Venus and Uranus rotate clockwise when viewed from the north pole of the sun, while the sun spins counterclockwise. This difference in the rotational and orbital directions is defined as retrograde motion.
7. What is an antipode?
Answer:
The direct opposite of something (ex: place, location, etc.)
Explanation:
My dictionary told me.
What is the measure of the average kinetic energy of the particles in a material known as?
Answer:
Temperature
Explanation:
Answer:
Tempature
Explanation:
Similarities among vertebrate embryos suggest evolution from a common ancestor. * True or False?
Answer:
I think its true
Explanation:
HELP ME ASAP!!!!
Select the correct answer.
What are ectothermic species?
A.
species that can generate heat from their internal processes
B.
species that live in cold climates
O c. species that derive heat from the environment
D.
species that live in the ocean
Answer:
A.........................
Answer:
Your answer is C). The prefix "ecto-" means outer or outside, meaning an ectothermic species gathers heat from outside their bodies.
A cell contains the same DNA as its parent cell has a result of which process
Answer:
Mitosis
Explanation:
Mitosis is the cell division that produces two daughter cells with the same DNA as the parent cell.
Imagine you discover a new species of primate. It has a medium body size (about 35 lbs.), wide incisors, and molars with low and rounded cusps. Based on this information only, what can you hypothesize about this new species' behavior and ecology? A. It is probably a follore B. It is probably an faunivore C. It is probably an insectivore. D. It is probably afrugivore
Answer:
D. It is probably a frugivore
Explanation:
A frugivore is an herbivore or omnivore that prefers to eat fruit, although they may also eat seeds, roots, leaves, etc. It has been proposed that humans evolved from tree-dwelling frugivores. The dental characteristics of the frugivorous primates include large incisors, as well as low and rounded cusps (referred to as bunodont molars). Moreover, frugivorous primates also include the entire spectrum of body sizes.
What acronym means "as needed"?
Answer:
PRN
Explanation:
Answer:
PRN
Using PRN or “As Needed” Medicines Safely.
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