)hle lac genes of a lacl mutant would be expressed continuously, regardless of w
ID: 211968 • Letter: #
Question
)hle lac genes of a lacl mutant would be expressed continuously, regardless of whether lactose is present D) Translation results in the production of three separate protein products. E) All of the above are true (there is no false statement). 26) A mutation in a eukaryotic cell has altered the enzyme that adds poly-A tails to RNA transcripts such that the enzyme adds only five A's. This would most likely have which of the following effects? A) Translation will result in shorter polypeptides. B) Silencing by miRNAs will no longer be effective. C) mRNAs will not be sequestered to specific locations in the cell. D mRNAs will tend to be destroyed after only a short period of time in the cytosol E) An initiation complex will be slower to form. MP-phosphodiesterase is an enzyme that catalyzes the reaction cAMP AMP. The free energy change for this reaction is strongly exergonic. If a high concentration of cAMP phosphodiesterase were introduced into the cytoplasm of E. coli, under which conditions, if any, would there be a high rate of transcription of the lac operon? A) glucose present and lactose absent B) glucose present and lactose present glucose absent and lactose present D) glucose absent and lactose absent atuo the operon will never be transcribed at a high rate 28) The figure below shows a replication fork in E. coli. At which of the indicated positions would you expect to see a 3'-OH? A) A and B. B) C and D. C A and C D) B and D. E) A and D.Explanation / Answer
27) D option is correct
Without catabolic activator protein (CAP) RNA polymerase cannot binds with lac operon pomoter very well. So the transcription is not possible at high rate. CAP binds to the DNA just before the lac operon promoter and helps RNA polymerase attach to the promoter and helps high lavel of transcription.
But here CAP is not present.
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