Which of the following DNA regions is NOT involved on gene expression regulation in Eukaryotes?. ( not enhancer or promotor-proximal) A. Promoter-proximal B. Promoter C. Enhancer D. Operator

Which of the following statements about trp operon regulation is TRUE? A. Low trp levels result in trp repressor binding. O B. High trp levels result in transcriptional antitermination. C. Low trp levels cause the ribosome to fall off at the trp codons in the upstream ORF. O D. High trp levels cause the ribosome to fall off at the trp codons in the upstream ORF. O E. Low trp levels result in transcriptional antitermination. QUESTION 34 Consider the following partial diploid for the lac operon system. lacl+ O+ lac Z+Y-A- lacls O+ 1. 2. lac Z-Y+ A+ In this configuration, which of the following statements is TRUE? A. With no lac present, ZYA will all be expressed. B. with lac present none of the genes (ZYA) will be expressed. O C. With no lac present, only YA will be expressed. D. None of these answers is correct. E. With no lac present, only Z will be expressed.

Two different types of gene regulatory elements are DNA sequence and protein-based. Which of the following describes them, respectively?   a. one blocks translation, the other blocks transcription   b. The first is an aporepressor, the second is a promoter   c. The first is an enhancer, the second is a repressor   d. The first is a activator, the second is a an attenuator   e. one is an activist, the other is a protestor

3. Inducers: a. transcribe a messenger off a DNA template b. bind to ribosomes to activate the production of specific proteins c. are a molecule that binds to a repressor to activate it d. are essential to function of transfer RNAs during translation e. bind to repressor protein and transcription of mRNA can then take place

Methylation can alter the process of gene expression because: B. By causing DNA to coil more tightly. A. By derailing the cellular transcription machinery. C. By removing the gene from the genome altogether. D. ALL answers A, B and C are correct. E. Only answers A and B are correct, but not C.

Binding of______ to_______ in DNA can increase the rate of transcription of specific genes. a. activators; repressors b. activators; enhancers c. repressors; operators d.repressors; enhancer

A high rate of transcription initiation from promoters in bacteria can be achieved by which of the following? a. the presence of perfect consensus sequences at the -35 and -10 positions of the promoter. b. the binding of an activator protein close to the promoter. c. the presence of an UP element immediately upstream of the promoter. d. a and c, but not b e. a, b, and c

Which of the following is false regarding the role of mediator complex in eukaryotic transcription initiation? a. Mediator complex interacts with RNA pol II b. Mediator binds to upstream enhancer sequences c. Mediator interacts with general transcription factors d. Mediator interacts with transcriptional activators e. All of the above are true about the mediator complex