Biochemistry in Biotechnology MCQs

Which one of the following is an ABC transporter?

Natural proteins are composed primarily of 20 α-amino acids. Which one of the following statements is true for any of these amino acids in a solution of pH 1.5?

Which one of the following statements is NOT true?

Analysis of a hexapeptide using enzymatic cleavage reveals the following result: • Amino acid composition of the peptide is: 2R, A, V, S, Y • Trypsin digestion yields two fragments and the compositions are: (R, A, V) and (R, S, Y) • Chymotrypsin digestion yields two fragments and the compositions are: (A, R, V, Y) and (R, S) • Digestion with carboxypeptidase A yields no cleavage product. Given: Trypsin cleaves at carboxyl side of R. Chymotrypsin cleaves at carboxyl side of Y. Carboxypeptidase A cleaves at amino side of the C-terminal amino acid (except R and K) of the peptide. The correct amino acid sequence of the peptide is:

Which of the following strategies are used by cells for metabolic regulation? P. Phosphorylation-dephosphorylation Q. Allostery R. Feedback inhibition

Levinthal's paradox is related to

An enzymatic reaction exhibits Michaelis-Menten kinetics. For this reaction, on doubling the concentration of enzyme while maintaining [S] >> [E0],

In general, which one of the following statements is NOT CORRECT?

Which one of the following statements is CORRECT for enzyme catalyzed reactions? ( ΔG is Gibbs free energy change, Keq is equilibrium constant)