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gulaghasi [49]
3 years ago
7

Which of the following statements about peptide bonds are true? 1) A tetrapeptide contains five amino acid residues. 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. 3) Peptide bonds are ester linkages. 4) Peptides are polymers of amino acids. 5) Peptide bond formation is a hydrolysis reaction
Biology
2 answers:
Y_Kistochka [10]3 years ago
7 0

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.

chubhunter [2.5K]3 years ago
6 0

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."

<h2>Further Explanation:  </h2><h3>Amino acids  </h3>
  • 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.
<h3>Proteins  </h3>
  • 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.
<h3>Peptide bonds  </h3>
  • 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  

<h3>Learn more about: </h3>
  • 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

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