There are 800 amino acids, of which the total number of amino groups is 810 and the total number of

The answer is b Remember the formula: number of peptide bonds = total number of amino acids - number of peptide chains Each dehydration condensation consumes an amino group and a carboxyl group to obtain a peptide bond.

So the peptide bond number is 800-2=798 which excludes c d, so 798 amino groups are consumed, leaving 810-798=12 amino groups.

798 carboxyl groups are consumed, leaving 808-798 = 10 carboxyl groups.

So choose B

Answer] B Answer Analysis] Test Question Analysis: Since there are 800 amino acids, of which the total number of amino groups is 810 and the total number of carboxyl groups is 808, the R group contains a total of 10 amino groups and 8 carboxyl groups, then the number of common peptide bonds of proteins containing 2 peptide chains synthesized by these amino acids = the number of amino acids The number of peptide chains = 800 2 = 798 (pieces); Ammonia base = amino group at one end of the polypeptide chain + ammonia base on the R group = 2 + 10 = 12 (pcs), carboxyl base = carboxyl number at one end of the polypeptide chain + number of carboxyl groups on the R group = 2 + 8 = 10 (pcs), in summary, b is correct.

Test point: This question tests the knowledge related to the structure of proteins, and is intended to test the candidate's ability to use the knowledge and opinions learned to explain and reason about certain biological problems through comparison, analysis and synthesis, and make reasonable judgments or draw correct conclusions.

b! It's not that hard! Number of peptide bonds = number of amino acids - number of peptide chains, number of amino acids = number of peptide chains + number of amino acids on the R group, number of carboxyl groups = number of peptide chains + number of carboxyl groups on the R group.

Answer] B Answer Analysis] Test Question Analysis: The amino acids that make up proteins have at least one amino group and one carboxyl group, and they are attached to the same carbon atom. The number of amino acids is known to be 800, from the total number of amino groups 810 and the total number of carboxyl groups 808, it can be seen that the number of ammonia groups on the R group is 10, and the number of carboxyl groups is 8. Peptide bonds are formed by dehydration and condensation between amino acids (n amino acids form m peptide chains can form n m peptide bonds), and amino acids are connected into peptide chains through peptide bonds, one end of a polypeptide chain is an amino group, and the other end is a carboxyl group; From this, it follows:

Protein common peptide bonds consisting of 800 amino acids with 2 peptide chains: 800 2 798; Amino group: 2 10 12 pcs.; Carboxyl:

2 8 10 pcs; Item B is correct.

Test point: This question examines the structural characteristics of amino acids and the relevant calculations of amino acid dehydration and condensation to form polypeptides, which is intended to test the candidate's ability to accurately describe biological content in various forms of expression such as words, diagrams, and mathematical methods.

Answer] B Answer Analysis] Test Question Analysis: There are 800 amino acids, of which the total number of amino groups is 810, the total number of carboxyl groups is 808, and it is inferred that there are 10 amino acid R groups with amino groups, 8 amino acid R groups with carboxyl groups, peptide bond number = amino acid number - peptide chain number = 800-2 = 798;1 peptide chain contains at least one amino group at one end, 1 carboxyl group at the other end, 2 peptide chains contain at least 2 amino groups and 2 carboxyl groups, plus 10 amino groups on the R group, so there are 12 amino groups in total, plus 8 carboxyl groups on the R group, so there are 10 carboxyl groups in total, so b is correct.

Answer] B Answer Analysis] Test Question Analysis: 800 amino acids constitute 2 peptide chains, with a total of 798 peptide bonds, 800 amino acids, 810 amino groups, and 808 carboxyl groups, indicating that there are 10 amino groups and 8 carboxyl groups on the R group, and each of the 2 peptide chains has a free amino group and a free carboxyl group, so there are 12 amino groups and 10 carboxyl groups, so B is selected.

Answer] A Answer Analysis] Test Analysis: Number of peptide bonds = number of amino acids - number of peptide chains, that is, 800 - 3 = 797;The number of ammonia in the protein = the number of peptide chains + the number of ammonia in the R group, among the 800 amino acids, there are 810 amino groups and 808 carboxyl groups, indicating that there are 10 free amino groups and 8 free carboxyl groups in the R group, so the free ammonia number in the protein is 13 and the carboxyl number is 11, so A is correct.

Test point: This question mainly examines the process of amino acids forming proteins, and is intended to test the candidate's ability to understand the main points of the knowledge learned, grasp the internal connection between knowledge and calculate.

Answer] B Answer Analysis] Test Question Analysis: The number of peptide bonds is equal to the number of amino acids and the number of peptide chains, so when amino acids form proteins, a total of 798 peptide bonds are formed, and each peptide bond needs to consume 1 amino group and 1 carboxyl group, so the remaining ammonia number is 810 798 12; In the same way, the number of carboxyl groups is 808 798 10, so b is correct.

Test point: This question mainly examines the general formula of amino acids and the process of amino acids forming proteins, and is intended to test the candidate's ability to understand the key points of the knowledge learned, grasp the internal relationship between knowledge, and form the network structure of knowledge.

Answer] B Answer Analysis] Test Question Analysis: Number of Amino Acids Number of Peptide Chains + Number of Peptide Bonds. 800 amino acids contain 810 amino groups, 10 of which are in the R group and 808 carboxyl groups, of which 8 amino groups are in the R group.

Test Points: This question examines the structure of proteins and is intended to test the student's ability to recognize and use the knowledge points listed in a relatively simple context.

Number of peptide bonds = number of amino acids - number of peptide chains = 800-2 = 798;

For each peptide bond formed, an amino group and a carboxyl group are consumed, so the ammonia base = total number of amino groups - number of peptide bonds = 810-798 = 12, carboxyl base = total number of carboxyl groups - number of peptide bonds = 808-798 = 10.

This question is not difficult, carboxyl number = number of peptide chains + number of carboxyl groups on the r group, number of amino numbers = number of peptide chains + number of amino numbers on the r group! Number of peptide bonds = number of amino acids - number of peptide chains b.

Due to the formation of 4 polypeptides, there are 1000 amino acids, and there are a total of 1000-4=996 peptide bonds.

If there are 1020 amino groups, 1050 carboxyl groups, and only 1000 amino acids, then there are 1020-1000 = 20 free amino groups (that is, amino groups on the R group). Similarly, there are 50 carboxyl groups.

There are 4 more polypeptides, each of which has an amino group at one end and a carboxyl group at the other end, so there are 4 amino groups and 4 carboxyl groups.

It adds up to 24 amino groups and 54 carboxyl groups.

Peptide bond 1000-4=996

Amino 4+(1020-1000).

Carboxyl 4+ (1050-1000).

The special recommended answer amuses me, how can the peptide bond number be 999!!

The number of peptide bonds is 996, the number of ammonia is 1119, and the number of carboxyl groups is 1149

The answer is b

Remember the formula: number of peptide bonds = total number of amino acids - number of peptide chains.

Each dehydration condensation consumes one amino group and one carboxyl group.

Get a peptide bond.

So the peptide bond number is.

CDs can be excluded

So 798 amino groups are consumed.

810-798=12 left

amino groups consume 798 carboxyl groups.

808-798=10 remains

carboxyl group so choose b

800 amino acids to form a chain has 799 amino acids, and one more chain breaks one more peptide bond, so it is 798 peptide bonds. 800 amino acids should have 800 carboxyl groups and 800 amino groups, but there are 8 more amino groups, indicating that the side chains of some amino acids contain amino groups, which should be added, and the two peptide chains, two carboxyl groups, and ten amino groups.

There are 798 peptide bonds, 2 amino groups, and 10 carboxyl groups.

800 amino acids, 2 peptide chains, so the number of peptide bonds is 800-2=798; The formation of each peptide bond consumes 1 amino group and 1 carboxyl group, for a total of 798 amino groups and 798 carboxyl groups, so the number of amino groups is 800-798 = 2 and the number of carboxyl groups is 808-798 = 10.

According to the general structure of amino acids, there is at least one amino group on each amino acid, and the most amino group should be on the R group, 800 amino acids and 800 amino groups, so it can be inferred that there is no amino group on the R group of these 800 amino acids.

If a peptide chain is formed, there should be only one free amino group, and the other amino groups will undergo a dehydration condensation reaction with the carboxyl group of the next amino acid.

If you make up two peptide chains, there should be only 2 amino groups.

If this question is about a carboxyl group, then according to the general structure of amino acids, each amino acid has at least one carboxyl group on it, and the carboxyl group should be 800 amino acids and 808 carboxyl groups on the R group, so it can be inferred that there are 8 carboxyl groups on the R group of these 800 amino acids.

The two peptide chains have two free carboxyl groups and 8 on the R group, for a total of 10.

Each peptide chain has at least 1 amino group, if there is more than 1, there is an amino group on the R group of the amino acid; There are 800 amino acids, of which the total number of amino groups is 800, and each amino acid contains at least 1 amino group, which means that the R group of these amino acids does not contain an amino group; Therefore, the number of amino groups shared by the proteins of the two peptide chains is 2; Similarly, the number of carboxyl groups is 2+8=10.

Number of peptide bonds = number of amino acids - number of peptide chains = 800-2 = 798;

Each time a peptide bond is formed, it is necessary to consume a beam of ammonia and carboxyl groups, so the ammonia base = total number of amino groups - number of peptide bonds = 810-798 = 12, carboxyl number = total carboxyl group acorn number - peptide bond number = 808-798 = 10.

Remember the formula: number of peptide bonds = total number of amino acids - number of peptide chains One amino group and one carboxyl group are consumed for each dehydration condensation to obtain a peptide bond.

So the peptide bond number is 800-2=798 which excludes c d, so 798 amino groups are consumed, leaving 810-798=12 amino groups.

798 carboxyl groups are consumed, leaving 808-798 = 10 carboxyl groups.

Give a good review.

b；Number of peptide bonds = 100-2

Ammonia base = 110-100 + 2

Carboxyl base = 108-100 + 2