Are proteins made up of multiple amino acids?

That is, about 20 kinds of amino acids are composed of different combinations and different orders.

There are a total of 22 types of protein amino acids, of which 20 are called common amino acids or basic amino acids.

Amino acids, are organic compounds containing basic amino and acidic carboxyl groups, and the chemical formula is RCHNH2Cooh. A compound formed after the hydrogen atom on the carbon atom of carboxylic acid is replaced by an amino group.

The amino acid molecule contains two functional groups, amino and carboxyl. Amino acids are the basic substances that make up proteins needed for animal nutrition.

Amino acids are colorless crystals with a melting point of more than 200, which is much higher than that of ordinary organic compounds. -Amino acids have 4 different tastes: sour, sweet, bitter, and fresh. Monosodium glutamate and glycine are the most used umami seasonings.

Chemical properties. 1. Reaction of amino group: acylation reaction; reaction with nitrous acid; reacts with aldehydes; sulfonylation reaction; reacts with DNFB; Salt reaction.

2. The reaction of the carboxyl group of the amino acid is the same as other carboxylic acids, and under certain conditions, acylation, esterification, decarboxylation and salt formation reactions can occur.

3. Reaction with ninhydrin hydrate: -amino acids and ninhydrin hydrate are heated together in a weakly acidic solution, and the corresponding -ketoic acid is generated by oxidative deamination, which is further decarboxylated to form aldehydes, and hydrated ninhydrin is reduced to reduced ninhydrinhydrone.

In the weakly acidic solution, the ammonia removed from the reduced ninhydrin and amino acids reacts with another hydrated ninhydrone to condense to form a blue-purple complex, proline and hydroxyproline react with ninhydrin to produce a yellow substance, and the rest of the -amino acids react with ninhydrin to produce a blue-purple substance. This color reaction is often used for colorimetric determination of -amino acids and color development for color layer analysis.

The above content reference:

Encyclopedia - Amino acids.

Amino acids, the basic units that make up proteins.

ExceptGlycineThe outside are -amino acids.

Protein is composed of C (carbon), H (hydrogen), O (oxygen), N (nitrogen), and general proteins may also contain P (phosphorus), S (sulfur), Fe (iron), Zn (zinc), Cu (copper), B (boron), Mn (manganese), I (iodine), Mo (molybdenum), etc.

Ligation method: use about 20 kinds of amino acids as raw materials in the cytoplasm.

ribosomes.

, the amino acid molecules are linked to each other to form peptide chains. The amino group of one amino acid molecule and the carboxyl group of another amino acid molecule.

The combination of a molecule of water and a connection is called dehydration condensation. The bond that is formed between the carboxyl group and the amino group through the condensation reaction that connects two amino acid molecules is called a peptide bond.

Compounds formed by peptide bond bonding are called peptides.

Eight kinds. They are: methionine, valine, lysine, isoleucine, phenylalanine, leucine, tryptophan, threonine.

It is amino acids other than proline that are all -amino acids, and glycine is -amino acids.

Do not divide which. The definition of amino acids in biology is different from that in chemistry, where amino groups and carboxyl groups are found as long as there are amino groups. In living organisms, an amino group and a carboxyl group are attached to the same carbon atom in the amino acids that make up living organisms. i.e. amino acids.

There are nearly 300 kinds of amino acids found in various organisms, but only 20 kinds of amino acids are involved in the urban construction of protein composition, which are called basic amino acids or essential amino acids. Among these 300 amino acids, those involved in protein composition are called protein amino acids, and those that do not participate in protein composition are called non-protein amino acids.

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There are more than 20 kinds of amino acids that make up proteins.

Amino acids are the basic building blocks of proteins, which are closely related to life and various forms of life activities, and proteins are involved in every cell and all important components of the body.

Protein accounts for 16% of the body's weight, which means that a 60kg adult canton Lu person has about protein in his body. There are many types of proteins in the human body, with different properties and functions, but they are all composed of more than 20 kinds of amino acids (amino acids) in different proportions, and are constantly metabolized and renewed in the body.

Protein composition and characteristics.

Protein is composed of C (carbon), H (hydrogen), O (oxygen), N (nitrogen), and general proteins may also contain P (phosphorus), S (sulfur), Fe (iron), Zn (zinc), Cu (copper), B (boron), Mn (manganese), I (iodine), Mo (molybdenum), etc.

The percentage of these elements in protein is about: carbon 50%, hydrogen 7%, oxygen 23%, nitrogen 16%, sulfur 0 3%, and other trace amounts.

1) All proteins contain nitrogen, and the nitrogen content of various proteins is very similar, with an average of 16%.

2) Protein coefficient: The presence of 1 g of nitrogen in any biological sample indicates the presence of about 100 16 = proteins, often called protein constants.