Regarding the structure of amino acids that make up proteins, the correct statement is

a Correct Proline, 4 hydroxyproline, etc., which are converted from proline after protein synthesis, contain imino groups Most of the rest contain a-amino groups B Error Glycine is a chiral carbon atom No optical rotation Its r group is a hydrogen atom c Correct Although organisms contain a small amount of d amino acids, they do not participate in the composition of protein molecules, but appear in some physiologically active molecules such as small peptides d False Reason is the same as a e error The classification of amino acids is carried out according to the structure or properties of the R group.

1. Characteristics: The amino acids that make up proteins contain at least one amino group and one carboxyl group, and all of them have an amino group and a carboxyl group connected to the same carbon atom; The amino group of an amino acid reacts with the carboxyl group of another amino acid to remove 1 molecule of water, and the two amino acids are linked by a peptide bond to form a dipeptide, where the structure of the peptide bond is -co-nh-.

2. The general structure is as follows:

There are a total of 20 kinds of amino acids that make up proteins, and all of them are L-type amino acids except for glycine (achiral C atom), that is, they all have an asymmetric C atom and have optical rotation. The carboxyl and amino groups are attached to the same C atom, and the other two bonds are attached to an H and R groups, respectively. Proline is a subamino acid.

If you look at the biochemistry book, it's very clear. There are also structural general types.

Search:] Briefly describe the structural characteristics of amino acids that make up proteins and the general questions and answers on their structures.

Answer]: After the protein is completely hydrolyzed, it is proved by chemical analysis that its basic unit of composition is -amino acid.

Regarding the description of amino acids that make up proteins, the following is correct ().

a.All are L configurations except for Gly.

b.Contains amino and carboxyl groups.

c.Both can have a purple reaction with the biuret reagent.

d.All have polar silver digging side chains.

e.The average lease is of the D configuration.

Correct Answer: a

Answer] :d all proteins are made up of 20 different L-type amino acids linked together to form polymers, which are called residues.

Proteins are made up of amino acids

..The general formula of the structure of r amino acids is: H2N-C-Cooh|.h

The different types of amino acids due to the difference in the R group of amino acids.

When you say that a protein consisting of 20 amino acids is made up of 20 amino acids, there are 20 essential amino acids, and these 20 types refer to different amino acids composed of 20 different R groups, not "each protein has 20 amino acids".

I typed "...It's for space, and it has nothing to do with the general structure].

a, is the general formula of the structure of the amino acids that make up proteins, a is correct;

b. The amino acids that make up proteins contain not only amino and carboxyl groups, but also carbon atoms, hydrogen atoms and R groups.

c. High temperature changes the spatial structure of the protein, but does not hydrolyze the peptide bond, and C is wrong;

d. The dehydration condensation reaction is the process of removing 1 molecule of water from the carboxyl group of an amino acid and the carboxyl group of another amino acid

Therefore, a

a. The basic unit of protein is amino acids, and a is correct;

b. Amino acids form peptide chains through dehydration and condensation, and then form proteins, b is correct;

c. Different protein molecules have different spatial structures and therefore have different functions.

d. Protein molecules contain one or more peptide peptide chains, which are combined with each other through certain chemical bonds, d is correct

Therefore, c

a amino acid is the building block of a protein, so a is correct;

b In addition to C, H, O, N and other elements, general proteins may also contain P, S, FE (iron), Zn (zinc), Cu (copper), etc., so b is correct;

C enzyme is a protein, which is denatured by heating and loses its catalytic activity, so C is wrong;

d The main component of hair is protein, so d is correct

Therefore, c