Please ask two high school biology questions, thank you

1 No, glucose is directly utilized, and sucrose should be decomposed into a molecule of fructose and a molecule of glucose.

2b is the codon sequence of the protein is measured first, the mRNA is reversed, and the DNA sequence is complemented.

1 No. Sucrose is used for plant tissues, and glucose is used for animal tissues. Under animal tissue culture conditions, only glucose can be used! Animals can't take advantage of sucrose!

2 b Exclusion can also be done.

1. No, the main role of sucrose is to maintain osmotic pressure. 2、b

1 No, plant tissues use sucrose, and animal tissues should use glucose. 2 b

1.No, it should be saline. 2．b

This is a question of osmotic pressure, and the first thing you have to figure out is that it's water that bursts the cell, not ions, so in this case, it's water that goes in and out of the cell membrane.

If you want to understand how this phenomenon works, then you can continue to talk about the normal situation of the cell, and we can think of it as being in the NaCl solution, which is normal saline, and the cell at this time is neither bloated nor shrunken, that is, the osmotic equilibrium inside and outside the cell, to put it simply, the concentration of ions inside and outside the cell is comparable, and there is no concentration difference in the solution, so there is no transfer of water (in fact, there is a transfer, but the amount of transfer is called dynamic equilibrium, which goes in = comes out So it's the same as not transferring) So this question is b

I understood, but I didn't say it a little messy.

Pick B. For a. Mature red blood cells do not have a nucleus, so the ATP in red blood cells is very limited, and in order not to consume energy, red blood cells generally do not let inorganic salts in and out. The incoming and outgoing of inorganic salts consumes their energy.

b, water, is passively transported in and out of red blood cells, and does not consume energy.

C and D, I won't talk about it.

However, I don't know if it's accurate to explain this way, after all, high school biology seems to be a little far away from me. Hope it helps.

Under the normal morphology of red blood cells, the speed of both inorganic salts and water molecules entering and exiting the cell is equal, so a b is correct, as for c d, because the comparison is of different substances, we can only qualitatively compare the size of its entry and exit velocity, because the environment of red blood cells in normal form is a very low concentration solution (such as NaCl solution), and the number of water molecules is much greater than that of inorganic salts. Therefore, choose D.

Good luck learning backgammon....

Let's choose the fourth. Because the normal concentration of human body fluids is 0.9 percent of NaCl solution, the water from the outside enters the cell first at the beginning, and when a certain amount is reached, the concentration of the outside world is large, and the attraction to water is strong, so the water in the cell will flow out.

Uh, it should be. But it's not sure if it's right or not.

1. a.When transcribing DNA into RNA, it is three bases translating one amino acid.

Now there are a total of 1420 + 840 = 2260 amino acids on the two peptide chains of the protein, correspondingly, there are 2260 * 3 = 6780 bases on the RNA, 6780 * 2 = 4520 bases on the DNA, and the bases on the DNA are all paired, that is, there are 6780 pairs of bases on the DNA. Each pair of bases on DNA is composed of a purine and a pyrimidine, so there are 6780 pyrimidine bases in the translation region of the entire gene, and each gene has some bases that are not involved in transcription, so it is said that there are at least 6780 pyrimidine bases.

b.The main function of a protein is determined by the spatial structure of the peptide chain. The type of amino acid is also relevant, but not the main one.

2.The specific function of biofilms is determined by glycoproteins, proteins are determined by genes, but sugars are not genetically determined.

Question 1 item b is wrong! Doesn't protein function only by the type of amino acids? What if the peptide chain bases are all of the same type, but they are arranged in a different order, or the number of bases is different? Children, the word "main" is circled, and the key is wrong.

Question 2 I think is correct, biofilms contain cell membranes and organelle membranes, exaCell membranes are made up of phospholipid molecules and proteins, and there are many types of proteins, each with different functions, that carry out the life activities of the cell.

Option A: Chain + Chain = Amino Acids Each amino acid is determined by 3 bases. 2260*3=6780 (since DNA is double-stranded, each base pair is composed of pyrimidines and purines, and the number of pyrimidines is equal to the number of purines).

Option b: It is also related to the order in which they are sorted.

(1420+840)*6\2=6780

The function of integrins is mainly determined by the order and quantity of amino acids, and there are 20 types anyway.

Question 1: The function of a protein can be determined by the spatial structure of the protein, the number of types of amino acids, and the order in which they are arranged. A term (1420 + 840) * 6 2 = 6780 An amino acid corresponds to 6 nucleotides, and the amount of pyrimidine in DNA is equal to the amount of purine.

Problem 2: Biomembranes include cell membranes, organelle membranes, nuclear membranes, and vesicles. For example:

During protein production, vesicles detach from the endoplasmic reticulum and fuse with the Golgi apparatus, which is related to the fluidity of the cell membrane.

Select D for the first question

A is not the peptide bond reduced by 4.

b No, the number of hydrogen atoms has increased by 8.

c No, the number of oxygen atoms has increased by 4.

D to choose A for the second question

In the title, a is assisted diffusion, b is free diffusion, c is active transport, d, one is ion channel 1, glycoprotein 2 and 4 is protein, and 3 is the phospholipid bilayer.

A Yes, auxin transport is active transport, so the way of secretion is CB wrong, 1 identifies thyrotropin-releasing hormone.

C is wrong, the 1234 in the picture can move.

D is wrong, the mode of transport of K+ when nerve cells form action potentials is C.

A total of three peptide chains and 2 amino acids are formed, so there are at least 5 amino groups and 5 carboxyl groups, which are 4 more than the original one.

The transport of auxin is active transport, while the C mode requires energy to be actively transported.

Indoleacetic acid is used to synthesize auxin, not protein, you should know this, it is not a macromolecule, and it does not need exocytosis!

First of all. Sunlight is absorbed by plants and then turned into sugars. Eaten by electric eels.

Electric eels absorb these sugars through digestion. Through active transport, sugars are transported to the power generation cells, which release electricity by converting oxygen and sugar into carbon dioxide and water and hydrolysis through respiration.

The plant light and action provide food, the electric eel digests the food through active transportation, and then produces ATP through respiration, and the electric eel releases energy with ATP water when discharging.

The reason for the C strain is that the C strain has an autoimmune reaction, and autoimmunity is an immune response that mistakes the normal cells of the human body for antigens. Of course, it is the body that acts, it must be the role of its own cells, and the cells of the A strain can be understood as antigens in popular understanding.

Gibberellin can promote plant growth, relieve dormancy and promote germination, but too high a dosage seems to cause a large number of flowers to fall off.

1) Proteins, B cells, plasma cells.

2) rejection, T cells.

The chemical formulas of the various amino acids in the question should be given.

Since only cysteine has an element S among the four amino acids, and there are E s in the 15 peptides, the hydrolyzed cysteine is an S element.

Looking at the chemical formula of the four amino acids, since the other three contain only 1 n element except lysine, first count one n of lysine, and use n-15, which is the amount of n element excess from lysine, that is, the amount of lysine hydrolysis.

The same goes for aspartic acid.

Since there are only 14 peptide bonds during hydrolysis, only 14 water molecules are consumed.

Option d pentadecapeptide is formed by the condensation and dehydration of 15 amino acids, and the hydrolysis consumes 14 water molecules.

The answer is: b.

By the changes that occur in the plant cell from stage I to stage, it can be seen that the cell grows, in the process:

A is correct, the cell grows, then the protein mechanism in the cell must increase, and the amount of protein synthesis in the cell is greater than the amount of decomposition.

B is wrong, the cell volume has increased, but the thickness of the cell wall has not changed, so the total amount of the cell wall has increased, and the component score of the cell wall is cellulose and pectin, so cellulose synthesis is always carried out in the cell.

c Correct, as the volume of the vacuole increases, the content of water in the cell gradually increases, and the water absorption capacity of the cell decreases.

dTrue, for any living cell to grow, it will contain a certain concentration of auxin in the cell.

The correct answer is BFrom stage I to stage The volume of plant cells should increase significantly, and the wall area should also increase significantly. And the thickness of the wall does not change, so the material that makes up the wall should increase.

Plant cell walls are made of cellulose and pectin. Cellulose synthesis must be carried out in the cell. The exclusion of other answers to this question is also difficult.

Item A is considered from the perspective of cell growth and differentiation. Item c is considered from the change of vacuole volume and cell fluid concentration during water absorption. Item d can be excluded from the relationship between cellular organisms and plant hormones.