biology multiple choice help 3. our understanding of promoter clearance by the p

Question

biology multiple choice help

3. our understanding of promoter clearance by the prokaryotic RNA polymerase is best matched to which hypothesis? A. Inchworming model of obligate release B. Scrunching model of stochastic release C. Transient excursion model of stochastic release D. Inchworming of stochastic release E. Scrunching model of obligate release 4. Operons are used by prokaryotes to regulate the expression of enzymes along a metabolic pathway. For the synthesis of tryptophan, which of the following describes regulation of tryptophan synthesis when tryptophan levels fall just below acceptable amounts? A. Trp-TrpR complex B. Regions 1 and 2 forming a hairpin C Regions 2 and 3 forming a hairpin D. Regions 3 and 4 forming a hairpin E. Band D

Explanation / Answer

The answer for Question 3 is B.

The promoter clearance by RNA polymerase is best matched to scrunching model of stochastic release.

The answer for Question 4 is C.

The regions 2 and 3 form a hair pin structure during low levels of tryptophan that in turn leads to intitation of tryptophan transcription.

The answer for Question 5 is E.

Both Rpb11 and Rpb12 were identified in the epitope tagging experiment. Hence, the answer is E.

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