Respuesta :
The correct answers are:
2) Peptide bonds form from nucleophilic attack by an electron pair on an alpha - amino nitrogen atom on an alpha - carboxyl carbon atom of another amino acid and
4) Peptides are polymers of amino acids.
A peptide bond is an amide type of covalent chemical bond. It is formed between two amino acids: C1 (carbon end) of one alpha-amino acid and N2 (nitrogen end) of another. Peptide bonds are the basis for the formation of a peptide chain and consequently protein. Formation of peptide bond is a condensation process, meaning that when two amino acids combine and link, water molecule is released and dipeptide is a product of that reaction.
The statement that is true about peptide bonds is;
"Peptide bonds form from nucleophilic attack by an electron pair on an alpha-amino nitrogen atom on an alpha-carboxyl carbon atom of another amino acid."
Further Explanation:
Amino acids
- Amino acids act as a building blocks of proteins. They are made up of an amide group (NH2) and a carboxyl group (COOH).
- There are 21 amino acids present in proteins and are classified as either essential or non-essential.
- Essential amino acids are those that are obtained from the diet as humans can not synthesis them. Non-essential amino acids on the other hand are those that can be synthesized in the body.
Proteins
- Proteins are among the four macro-molecules in living organisms others being; lipids, carbohydrates, and nucleic acids.
- Many amino acids join together through peptide bonds to form polypeptide chains that join to form proteins.
Peptide bonds
- Peptide bonds are type of amide linkages that join amino acids together to form polypeptides or proteins.
- Each amino acid in a protein is joined to another by a peptide bond.
- During the formation of a peptide bond a carboxyl group of one amino acid combine with an amino group of another amino acid and a molecule of water is released.
- A nucleophilic attack by an electron pair on an alpha-amino nitrogen atom on an alpha-carboxyl carbon atom of another amino acid results to the formation of a peptide bond between two amino acid.
- Therefore, peptide bond formation is an example of a dehydration reaction due to the release of water molecules.
Keywords; Proteins, amino acids, peptide bonds
Learn more about:
- Macromolecules: brainly.com/question/7173579
- Proteins: brainly.com/question/7173579
- Amino acids: brainly.com/question/2168303
- Peptide bonds: brainly.com/question/708241
Level: High school
Subject: Biology
Topic: Macro-molecules
Sub-topic: Peptide bonds and amino acids
