Asu Bio 340 Exam 3 | With Questions And Answers 100% Verified

A bacterium is unable to transport lactose into the cell to be broken down. Which gene is likely mutated in this bacterium? A. lacZ B. lacY C. lacI D. lacP E. lacO {Ans: B Explanation: If you can't transport lactose, then it means permease isn't working. So lacY is likely mutated since that is the gene that encodes permease.}Which of the following tends to loosen the interaction between DNA and histones? A. Acetylation of histone tails B. Deacetylation of histone tails {Ans: A. Acetylation of histone tails}Given the linear DNA molecule shown below, how many fragments would you expect if it was cut with BamHI and BcII? A. 1 B. 2 C. 3 D. 4 E. 5 {Ans: C Explanation: BamHI and BclI will cut the double-strand only once each, having three pieces of double-stranded DNA as a product.}Which molecule serves as the inducer for the lac operon? A. cAMP B. Glucose C. Lactose D. Allolactose {Ans: D Explanation: Allolactose is the molecule that binds to repressor protein, making it unable to bind to the operator.}Which type of mutation is most likely to produce a loss-of-function allele? A. The deletion of 6 nucleotides B. A point