Please explain the high school biology questions Master please enter O

1.Deoxyribonucleic acid (abbreviated as DNA), acid means acid, so A should not refer to a base.

If you say a on its structure diagram, it means base a. 2.Actually, it doesn't need to be infected with the virus.

If there is a disease, it is not that there is a virus that will cause the disease, but that the virus will accumulate to a certain number and cause a certain amount of damage to the body before it will manifest as disease. When antibodies are present in poultry, the virus can be eliminated before it becomes ill. Virus invasion does not mean disease, people will be invaded by many germs and pathogens every day, but they are all quickly resolved, are all of us sick people every day?

You're right? Anything else you don't understand?

1. DNA, the "A" in RNA refers to the base, that is, adenine, and does not contain five-carbon sugar.

2. If the newly ** poultry B is infected by the virus again, it will not get sick again, because its body produces corresponding antibodies and memory cells. It should not be replaced with "mild infection".

Correction 2, after the specific antibodies and memory cells are produced in the body, the corresponding antigen invades again, and it will still be sick, but the strength of the second immunity is much greater than that of the first immunity, and the time will be greatly shortened, this immunity is also called secondary immunity.

Glucose in the selection of BA sugars is the most commonly used organic matter in cellular respiration, that is, sugars are the main energy sources of aerobic and anaerobic.

b. The first two stages of aerobic produce reducing agent H, and the first stage of anaerobic produces reducing agent H.

c Cellular respiration is a gradual release of energy, so aerobic is divided into three phases, and anaerobic is divided into two phases. Extracorporeal combustion is the instantaneous release of energy. Imagine how an organism can stand the instantaneous release of energy in its body.

D water is the product of the third stage of aerobics, that is, the reducing agent H produced in the first two stages combines with O2 to form water. Anaerobic respiration does not involve oxygen, there is no third stage, and there is no water production.

A is false, because animal sugars are the main energy substances.

B is correct, the reduction of hydrogen [H], that is, Nadph, is a [coenzyme], which is produced by the oxidation of the pentose phosphate pathway.

C false anaerobic respiration also has a process It cannot be said that the role of instantaneous energy d water includes participation in the hydrolysis of proteins, participation in oxidation reactions, anaerobic respiration does not produce water, cytoplasm and mitochondria can be regarded as a long-term symbiotic process between mitochondria and cells, because mitochondria have their own DNA, although cytoplasm can carry out respiration, but can only carry out anaerobic respiration, and mitochondria can carry out aerobic respiration.

I choose ぐRegardless of whether it is aerobic or anaerobic respiration, the raw material is sugar.

c.Anaerobic respiration is also a gradual release of energy, but the amount released is small; Extracorporeal combustion is the instantaneous release of energy.

d.Anaerobic respiration, which produces lactic acid, does not produce water.

A is false, the textbook "generally speaking, the substance most commonly used for anaerobic respiration is glucose".

dFalse, [h] combines with oxygen to form water, and oxygen does not participate in anaerobic respiration.

BC is correct, but C is better in terms of the title (I think, because it contrasts more sharply) The first stage of both breathing styles is the same, both produce a small amount of [h] and release a small amount of energy, but the second and final stage of anaerobic respiration does not release energy (textbook quote; Anaerobic respiration only releases a small amount of energy in the first stage, producing a small amount of ATP), don't misunderstand the total formula. Aerobic respiration, on the other hand, releases energy in all three phases.

b, if you need to explain, please ask.

Red-green color blindness is genetic inheritance, x recessive inheritance. Patients with Klinefelter syndrome chromosomal variants have sex chromosomes 47,XXY, that is, 1 more X chromosome than normal males, so the disease is called 47XXY syndrome. The underlying defect is that males have an extra X chromosome, and the common karyotype is 47,XXY or 46,XY 47,XXY.

Both parents are heterozygous and carry the disease-causing gene.

Question 1: Select D

A: Adrenaline produces heat by speeding up metabolism, and skeletal muscle trembling seems to be neuromodulation, right?

B: I'm ...... this one

C: I don't know much about this gonad, but in the case of the thyroid gland, it should be the hypothalamus secreting thyrotropin-releasing hormone to act on the pituitary gland, then the pituitary gland releases thyroid-stimulating hormone to act on the thyroid gland, and finally the thyroid gland releases thyroid hormone.

Question 2: Select C

For thyroid gonads, please refer to question 1. The secretion of adrenal hormones should be the same as that of the thyroid gland and gonads (I'm weak again.) Only the islets are directly controlled by the hypothalamus.

Question 3: Select C

A: The cerebral cortex conducts only excitation.

B: The pituitary gland secretes only hormones.

C: That's fine, it can release hormones (such as thyrotropin-releasing hormone) and can also conduct excitability (cold receptors or something). ）

D: This. The lower nerve center of the human body. Does not secrete hormones.

All right. I'm here to join in the fun.

m bases control the synthesis of proteins, and there is only one chain to control the number of amino acids required for synthesis is m 6 (3 codons determine one amino acid).

N peptide chains are synthesized, so the number of peptide bonds formed is m 6-n into proteins with a relative molecular mass

Then the average relative molecular mass of amino acids is a+(m 6-n)18 divided by m 6, take a good look at why this formula is listed like this, if you have any questions, you can ask, I hope it will help you.

The maximum is a?? If the average is a, I can answer m

Let the average relative molecular weight of amino acids be x

Mean relative molecular weight of amino acids Number of amino acids-18 Number of water molecules = relative molecular weight of protein.

Number of amino acids = m 2 3

Number of water molecules = m2 3-n

x m 2 3-18 (m 2 3-n) = a solution to x

Set to x column: mx 6-18 (m 6-n) can solve x.

The one with the --co--nh-- group is a peptide bond.

A total of two peptide bonds, synthesized by three amino acids, so the tripeptide, the synthesis process removes two waters, so the atomic weight is reduced by 36

Big brother, I am in dire need of wealth.

If you find it difficult to see that ** is a peptide bond, it means that you have not understood the textbook well.

C is connected to N single bond and O double bond, which is a peptide bond. The structure of the amino acids shown can be inferred from the standard structure of amino acids. Tripeptide, synthesized to remove two water molecules, so reduce 36

--co--nh-- is a peptide bond, the compound has two peptide bonds, is a tripeptide, and the two water are removed, and the relative molecular mass is reduced36