April 2025 - BDS Biochem Quiz - 02

Which of the following is a feature of amino acids at their isoelectric pH?

• They have a net positive charge.

• They have a net negative charge.

• They are electrically neutral (zwitterions).

• They are maximally soluble in water.

FAD is a coenzyme for which type of enzyme?

• Hydrolase

• Isomerase

• Oxidoreductase (specifically, some aerobic dehydrogenases).

• Transferase

The primary structure of a protein is determined by:

• Hydrogen bonds between amino acid side chains

• Hydrophobic interactions between nonpolar amino acids.

• Disulfide bonds between cysteine residues.

• The sequence of amino acids linked by peptide bonds.

Based on their side chain character, which of the following amino acids would be classified as a basic amino acid?

• Valine

• Serine

• Arginine

• Glutamic acid

Competitive inhibitors of enzymes typically affect the:

• Vmax (maximum velocity) of the reaction.

• Catalytic efficiency of the enzyme.

• Km (Michaelis constant) of the reaction.

• pH optimum of the enzyme.