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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How is a scientific law formed?
Answer:
For a scientific law to form there has to be a lot of experiments and information about that. This is to help them make sure that they are correct
Explanation:
A student’s cat gave birth to a litter of kittens. She noticed that one of the kittens had brown fur and one of the kittens had white fur. Which of the following best explains how two kittens in the same litter can have different fur colors?
Explanation:
because the mom must be either brown your white and the dad must be the other color
The best explanation for the statement that how two kittens in the same litter can have different fur colors are the brown kitten and the white kitten have different combinations of the genes for fur color. The correct option is B.
What is genetics?The study of genetics covers how a person inherits traits from their parents. It explains how familial traits—be they simple like eye color or complicated like disease susceptibility—run in families.
Both genomics and genetics have an impact on health and disease. The study of genes and how particular traits or conditions are passed down from one generation to another is referred to as genetics. The study of a person's entire gene pool is referred to as genomics.
Therefore, the correct option is B. The brown kitten and the white kitten have different combinations of the genes for fur color.
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The question is incomplete. Your most probably complete question is given below:
A. The brown kitten and the white kitten must have different sets of parents
B. The brown kitten and the white kitten have different combinations of the genes for fur color
C.the brown kitten and the white kitten have different chromosomes for the 2 fur colors
D.the brown kitten has a different number of chromosomes than the white kitten
What is the minimum pH difference such that transfer of one H ion across the membrane would provide enough energy to make one molecule of ATP?
Answer:
The minimum difference is already the value of 1
Explanation:
When the pH is not balanced between the extracellular and intracellular environment, the cell could go into shock, that is why in the face of the minimal differences in pH between the internal or external environment, the proton pump is activated, this is how the hydrogen ion or positively charged protons cross the membrane and indirectly generate ATP molecules.
Easy 10 points . First one to answer gets brainly. Look at the picture & fill in the word that goes with the sentence .
Answer:
Its efficient use of cropland
Explanation:
4
Which is true for the beginning of the Cenozoic era? *
(1 Point)
Dinosaurs had killed all mammals
Mammals first appeared
Dinosaurs had become extinct
O Mammals and dinosaurs lived together
Answer:
Mammals first appeared
Explanation:
The dinosaurs became extinct one million years after the Cenozoic era started. The mammals first appeared as the modern culture first appeared in that era.
Answer is Mammals first appeared Dinosaurs had become extinct.This statement is true.
At the site of gas exchange in the lungs, where does the oxygen move?
O2 moves from the alveoli to the white blood cells.
O2 moves from the white blood cells to the alveoli.
O2 moves from the alveoli to the red blood cells.
O2 moves from the red blood cells to the alveoli.
Answer:
C. O2 moves from the alveoli to the red blood cells.
Explanation:
pls mark brainliest, u don't have to.
I got it correct on edge, have a good day :)
At the site of gas exchange in the lungs, oxygen moves from the alveoli to the red blood cells. Details about gaseous exchange can be found below.
What is gaseous exchange?Gaseous exchange is the process whereby gaseous substances especially oxygen and carbon dioxide move from one point to another in living systems.
Oxygen from the atmosphere goes into the body via the nose and is passed on to the lungs. The gases are exchanged in a compartment called alveoli or air sac.
The air sac then passes the oxygen to the red blood cells, which circulate it round the body to organs.
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Metamorphic rocks form when what is applied to an existing rock?
heat and pressure
rock and roll
gravity and steam
steam and time
Answer:
Heat and pressure i just took the test
Explanation:
PLEASE HELP! YOU GET 10 PTS!!
How have water and wind shape the Earth's surface?
TYSM!
Answer:
It has shaped things like the Grand Canyon
Explanation:
Bcause of erosion
Answer:
Water and wind shape the Earth's surface through weathering, erosion, and deposition. All three of these processes break rocks down and thus, changing the Earth's surface, as Earth's surface is mostly made of rock. Hope it helps!
Explanation:
what is a natural depression filled with standing freshwater called please help
Answer:
it was b!!!!!!!! i took the test
Patty's brother accidentally drops his plate. It falls to the floor and breaks. What do we know about energy in this example?
Energy is changed from one form to another as the plate falls.
There is no change in the form of energy as the plate falls.
Energy is created when the plate is dropped.
Energy is destroyed when the plate breaks.
Answer:
energy is changed from one form to another as the plate falls
Explanation:
energy cannot be created or destroyed. the energy changes from PE TO KE
A ---- is a multi-level network of feeding interactions, through which
both energy and matter move.
1. Food web
2. Food chain
3. Ecological Pyramid
4. None of the above
Answer:
1. Food web
HOPE IT HELP YOU
THANKS FOR POINTS
Your myth:Are parakeets and macaws related
Fact:
Evidence:
I will give 20 points
Answer:
yes
Explanation:
All birds in the bird family are related
Answer:
they are related because they are both parrots i actually have 3 parakeets
Explanation:
I really really want a macaw
You are involved in a biodiversity survey and encounter a meadow of grass. How would you best describe the grass?
Answer:
Monocot
Explanation:
All flowering plants (Angiosperms) are classified into monocots and dicots. Monocotyledons are plants that have one seed leaf (cotyledon) when the seeds germinate. These plants also have other features such as, for example, parallel-veined leaves, adventitious root system, flower parts in multiples of threes (i.e., 3, 6 or 9 petals), etc. Poaceae (Gramineae), also known as grasses, is a large family of monocotyledonous plants. Therefore, all the grasses are monocot.
If a person's body temperature were 37.5 °C (99.5 °F), the _____ would stimulate the _____ to lower the temperature.
A. brain; sweat glands
B. sweat glands; brain
C. spinal cord; muscles
D. muscles; spinal cord
Explanation:
the answer is B..your brain , sweat glands, 4 protection, during a high fever, sweating is your body attempts 2 cool off...
The process of ecological change in a community over time
Answer:
ecological succesion
Biology In which stage of the cell cycle does dna duplicate
Answer:
S Phase
Explanation:
DNA replicates in the S Phase . Please see images below for how the S Phase process works.
Within to the rock cycle, which of the following is NOT correct?
оооо
Metamorphic rocks may melt to become magma.
Sedimentary rocks may weather to become igneous rocks.
Heat and pressure may change igneous rocks into metamorphic rock.
Magma may crystallize to form igneous rocks.
Answer:
Did you get the answer
Explanation:
Pls help
Answer: the answer is B because the only way a igneous rock is formed is when it crystallize from the volcano or something like that
Hurry! Will give brainlest if correct worth 25 points! In which parts of the cell cycle would chromosomes be paired up? Check all that apply.
interphase
metaphase l
anaphase II
telophase II
metaphase ll
telophase l
Answer:b and d
Explanation:I think hope it helps
Answer:
The correct answers are B and D
9. The drawings represent the particles in a sample of
matter that underwent a change in state.
Based on the drawings, the change in state was most
likely
A. liquid to gas.
B. liquid to solid.
C. solid to gas.
D. solid to liquid.
Answer:
the answer is - d soild to liquid
Explanation:
y I choose d is when it is soild it will melt and it would become liquid
All living things begin as two cells. True False
Answer:
True
Explaination:
The idea that all living things are made up of cells which can only come from other living cells, is known as cell theory. All living things are made up of cells.
What is the medical significance of complete lack of growth on any of the plates?
The lack of oxygen, poor/ bad bacteria smear, or difference in temperature that prevents optimal growth, within media.
The medical significance of complete lack of growth should be in lacking of oxygen, bad bacteria, etc.
What is oxygen?Oxygen refer to the chemical element. It denotes the symbol with O and have the atomic number should be 8. It should be third common element in the universe after considering the hydrogen and helium.
Also, it is more than 5th of the earth atmosphere via the volume.
Therefore, The medical significance of complete lack of growth should be in lacking of oxygen, bad bacteria, etc.
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I need help please
Explanation:
A. Creativity
Creativity is a characteristic or trait in scientists or other answer seekers that allows them to think out of the box. It allows them to look through different perspectives to find new or other solutions to a problem.
Human what is the study of how humans inherit chromosomes.
A.Biology
B. Breeding
C. Genetics
D. Engineering
Answer:
C. Genetics
Explanation:
Answer:
90% sure its c
Explanation:
The stomach helps to digest food with
processes.
Answer:
Chemical and Physical Processes
Explanation:
I've watched Magic School Bus. pls mark brainliest
In DNA replication:
a) each new single helix is composed of 50 percent protein and 50 percent DNA protein.
b) each new triple helix is composed of one old DNA strand and two new DNA strands.
c) each new double helix is composed of one old protein strand and one new protein strand.
d) each new double helix is composed of one old DNA strand and one new DNA strand.
In DNA replication, each new double helix is composed of one old DNA strand and one new DNA strand. So, the correct option is (D).
What is DNA replication?DNA replication is defined as the biological process of making two identical copies of DNA from a single original DNA molecule that occurs in all living organisms, acting as the most essential part for biological inheritance.
It is the process by which the DNA of the genome is copied into cells, where a cell must first copy (or replicate) its entire genome before dividing so that each resulting daughter cell ends up with its own complete genome.
DNA replication involves:
Replication Fork Formation.Before DNA can replicate, the double stranded molecule must be "unzipped" into two single strands.
Primer Binding.The leading strand is the simplest to replicate.
Elongation.TerminationThus, in DNA replication, each new double helix is composed of one old DNA strand and one new DNA strand. So, the correct option is (D).
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when is speciation complete?
Answer:
Speciation has become complete when organisms of one population do not recognize the mating call of another population and so mating does not occur. Which of the following statements about reproductive barriers and speciation is true? Speciation can occur with even a single gene mutation if that mutation involves reproductive barriers.
Explanation:
When calculating heritability in finch beak size using parent/offspring data, we find that 70 percent of the variation in the trait is due to genetics. What might explain the remainder of the variation? Select all that apply.
A.
nutrition
B.
color
C.
precipitation
D.
stress
E.
rarity
F.
temperature
Answer:
A. nutrition
Explanation:
The most likely explanation for the remainder of the variation would be nutrition. Little is known about how exactly nutrition affects genetics and heritability, but it is known that it does. Scientists believe that traits that allow a species to feed more successfully have a drastically increased chance of appearing in offspring as it greatly contributes to their survival. When a trait does not allow the species to gain the proper nutrition, the species tends to develop other traits to accomplish this which then get passed on to offspring.
Answer:
A. Nutrition
C. Precipitation
F. Temperature
Learning Task 2. Find the equation of the line . Write in slope intercept form
and in standard form
1. m = -5, b= 1
3. (-2, 0) and (0,5)
2. (1, -2), (3, 3)
4. a = 2, b = -7
5.m=2,(3,-1)
Answer:
(1) m = -5, b= 1
[tex]\frac{x}{a} + \frac{y}{b} = 1[/tex]
put b=1 (given)
[tex]\frac{x}{a} + \frac{y}{1} = 1[/tex] => y = -x/a + 1
-1/a is representing slope here which is given as -5
-1/a = -5 => a = 1/5
slope intercept form
y = mx +b
y = -5x + 1
standard form
5x +y = 1
(2). (1, -2), (3, 3)
m = 5/2
slope intercept form
y - 3 = 5/2*( x -3)
y = 5x/2 -9/2
standard form
5x -2y = 9
(3). (-2, 0) and (0,5)
m = 5/2
slope intercept form
y - 0 = 5/2 ( x+2)
y = 5x/2 + 5
standard form
5x -2y = -10
(4). a = 2, b = -7
[tex]\frac{x}{2} + \frac{y}{-7} =1[/tex]
slope intercept form
y = 7x/2 -7
standard form
7x -2y =14
(5). m=2,(3,-1)
slope intercept form
y +1 = 2(x -3)
y = 2x -7
standard form
2x -y = 7
In humans, to fold the tongue is a dominant trait (L), and the straight tongue is the recessive trait. What are the probabilities that the offspring can fold the tongue?
The given question is incomplete as the genotype of the parents is not given, so the answer is providing in the followings case:
1. dominant parent and recessive parent
2. heterozygous parents
Answer:
1. dominant parent and recessive parent:
dominant parents can be represented by LL and recessive parent is represented by ll, so the gametes would be L, L and l, l.
so,
L L
l Ll Ll
l Ll Ll
so there are all offspring in heterozygous condition as we known one or two dominant allele masks the recessive allele for the trait so 100% offspring can fold their tongue.
2. heterozygous parents
In this case, parents have Ll genotype and gametes would be L and l for each parent so,
L l
L LL Ll
l Ll ll
In this case, one is pure dominant and two heterozygous whereas only one is recessive so, the phenotype of offspring that cant fol the tongue would be:
3/4 = 75%
When an ecosystem loses biodiversity, how does it change?
A. becomes less resilient
B. becomes fragmented
C. more efficient
d. easier to live in.
ANSWER ASAP.
