M4 L4 : Biochemistry Lecture

What is the stereochemistry of amino acids?

• -COOH group on the left

• -COOH group on the right

• -NH3+ group on the right

• -NH3+ group on the left

At what pH does an amino acid exist as a neutrally charged zwitterion?

• pH < isoelectric pH

• pH = isoelectric pH

• pH > isoelectric pH

• pH has no effect

What happens to the carboxylate anion when the pH < isoelectric pH?

• Remains neutral

• Loses a proton

• Gains a proton

• Becomes a zwitterion

What is the charge of the amino acid when the pH > isoelectric pH?

• Neutral charge

• Net negative charge

• Net positive charge

• No charge

What is the chirality center in amino acids?

• γ carbon

• β carbon

• δ carbon

• α carbon

What is the primary function of amino acids in the body?

• Energy production

• Structural support

• Cell signaling

• Immune response

Which amino acid is responsible for the blue color of the sky?

• Phenylalanine

• Tryptophan

• Leucine

• Arginine

What is the significance of the isoelectric point of amino acids?

• It determines the solubility of amino acids

• It affects the stability of proteins

• It influences the charge of amino acids

• It regulates the synthesis of DNA

What is the role of amino acids in enzyme catalysis?

• Structural support

• Energy production

• Act as cofactors

• Cell signaling

Which amino acid is commonly found in collagen?

• Proline

• Aspartic acid

• Lysine

• Glutamine