2. Watson and Crick proposed the B-form double helix model for DNA structure. What is the best nucleotide to be complementary to cytosine, C? (A) G (B) T (C) U (D) C (E) A

6. In study of enzyme kinetics, turnover number is defined as the number of substrate molecules converted to product in a given time on a single enzyme molecule when enzyme is saturated with substrate. Which of the following terms is equivalent to turnover number? (A) Km (B) Kd (C) Ka (D) Vmax (E) Kcat