MOLECULAR BIOLOGY QUESTIONS WITH 100% CORRECT ANSWERS 2025-26 Which ONE of the following IS NOT a structural gene in the lac operon? (EXAM MCQ) ** a) lacB b) lacA c) lacY d) lacZ - ANS-lacB (The structural genes are lacZ, lacY, and lacA — lacB is not one of them.) The bacterial chromosome is (EXAM MCQ) a) Always a single circular piece of DNA b) Contained in the nucleus of the cell c) Linear and/or circular DNA d) Replicated in a conservative manner - ANS-Always a single circular piece of DNA In terms of the initiation of mRNA synthesis, which ONE of the following statements is FALSE? (EXAM MCQ) a) Involves the binding of ribosome small subunit to the Shine-Delgarno sequence b) Involves the binding of RNA polymerase to a promoter sequence c) Is enhanced in prokaryotes by the presence of sigma-factors
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