Which of the following statements about peptide bonds are true? 1) A tetrapeptide contains five amino acid residues. 2) Peptide bonds form

Question

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

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Charlie 3 months 2022-02-11T09:59:21+00:00 2 Answers 0 views 0

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    0
    2022-02-11T10:00:53+00:00

    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

    0
    2022-02-11T10:01:03+00:00

    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.

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