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Amino Acids Structure and Properties

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Questions and Answers

Which of the following statements about amino acids is true?

All amino acids have a ring structure.
Amino acids do not contain any nitrogen atoms.
Amino acids are monomers that make up proteins. (correct)
There are approximately 300 amino acids found in the human body.

Which of the following is an example of a heterocyclic amino acid?

Glycine
Leucine
Tryptophan (correct)
Alanine

What is the defining structural feature of an imino acid?

Presence of an amino (-NH2) and a carboxyl (-COOH) group
Presence of an aromatic ring
Presence of a ring structure
Presence of an imine (NH) and a carboxyl (-COOH) group (correct)

Which of the following amino acids is classified as an aromatic amino acid?

Tyrosine (C) Signup and view all the answers

What is the distinguishing feature of alpha amino acids?

The amino group is attached to the same carbon as the carboxyl group. (D) Signup and view all the answers

Which of the following amino acids are classified as having nonpolar side chains?

Alanine, Valine, Leucine, Isoleucine (C) Signup and view all the answers

Which of the following amino acids are classified as having charged or ionic polar side chains?

Aspartic acid, Glutamic acid, Arginine, Lysine (C) Signup and view all the answers

Which amino acid is classified as purely ketogenic?

Leucine (C) Signup and view all the answers

Which of the following amino acids are classified as essential for human nutrition?

Methionine, Phenylalanine, Tryptophan, Valine (A) Signup and view all the answers

Which amino acids are classified as partially essential or semi-essential?

Histidine and Arginine (A) Signup and view all the answers