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Amino Acids and Proteins in Living Systems

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Amino Acids and Proteins in Living Systems

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Questions and Answers

What is the typical number of different proteins found in a cell?

20000

15000

5000

9000 (correct)

What is the primary function of proteins in the body?

To synthesize DNA

To catalyze reactions in living systems (correct)

To provide energy for the body

To regulate body temperature

What is the term used to describe the form of amino acids with both positive and negative charges?

Zwitterion (correct)

Ionized

Polarized

Neutralized

Which of the following amino acids does not have a stereocenter at the a-carbon?

Glycine (B) Signup and view all the answers

What is the term used to describe the shape of proteins that are found in skin, bone, hair, and nails?

Fibrous (D) Signup and view all the answers

What is the role of proteins in the diet?

To provide nitrogen and sulfur for the diet (D) Signup and view all the answers

What is the pH at which the majority of molecules of an amino acid have no net charge?

7.0 (B) Signup and view all the answers

Which of the following amino acids is a key precursor to neurotransmitters?

Tryptophan (D) Signup and view all the answers

What is the term for the modification of amino acids by certain organisms after biosynthesis?

Post-translational modification (B) Signup and view all the answers

What is the term for a molecule composed of 3 amino acids joined by peptide bonds?

Tripeptide (A) Signup and view all the answers

What is the side chain of the amino acid cysteine?

Sulfhydryl (D) Signup and view all the answers

What is the term for the bond between the a-carboxyl group of one amino acid and the a-amino acid group of another amino acid?

Peptide bond (B) Signup and view all the answers