Chapter 17 Study Questions--answers at end

Chapter 17 Study Questions--answers at end - CHAPTER 17...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
CHAPTER 17 STUDY QUESTIONS 1) Gene expression can be controlled at multiple levels. Which of the following levels of control would allow the most rapid response to environmental change? A. transcriptional control B. translational control C. post-translational control 2) E. coli and many other bacteria of the human gut need to have fine-tuned regulation of gene expression in order to: A. replicate their DNA B. metabolize nutrients of any sort C. effectively compete for space and nutrients. D. increase in size E. evolve over time 3) Although the expression of most genes is tightly regulated, some genes are expressed at roughly constant rates (i.e., constitutively). Which of the following genes would you predict to be constitutively expressed? A. genes involved in the biosynthesis of tryptophan (an amino acid) B. genes involved in the degradation of tryptophan C. genes involved in the degradation of arabinose, a sugar D. genes that that code for ribosomal RNAs E. genes involved in the transport of maltose, a sugar, into the cell 4) Which components of the lac operon might you expect to see utilized in the regulation of other genes? A. the operator B. the repressor C. the lacY gene D. the CAP binding site E. allolactose serving as an inducer 5) Full induction of the lac operon occurs when: A. lactose levels are low and glucose levels are low B. lactose levels are low and glucose levels are high C. lactose levels are high and glucose levels are low D. lactose levels are high and glucose levels are high. 6) Bacterial and eukaryotic cells primarily control of gene expression at the level of transcription. If instead cells exerted control of gene expression primarily at the post-translational level, what would be different? A. The ability to rapidly respond to environmental change would be reduced. B. Cells would expend significantly more energy. C. Genes would no longer be transcribed. D. Translation of mRNA into protein would not occur. E. There would no longer be a need for promoter sequences in DNA. 7) An experimental technique that allows an investigator to screen for mutants that cannot utilize a particular nutrient is called: A. mutation induction B. replica plating C. use of antibiotic-containing plates D. selection for regulatory mutants E. DNA footprinting 8) In the first step of their experiments, Jacob and Monod treated E. coli cells with UV light or X-rays in order to: A. decrease the number of viable cells B. induce DNA repair enzymes C. increase the frequency of mutations in all genes D. induce mutations only in regulatory genes and sequences of the lac operon E. induce mutations only in genes (both regulatory and structural) of the lac operon 9) In the replica plating technique used to screen for mutants that cannot utilize a nutrient, one expects to find: A. the same number of colonies on the master and replica plates B. many fewer colonies on the replica plate C. just a few less colonies on the replica plate D. just a few more colonies on the replica plate
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/08/2008 for the course BIOL 203 taught by Professor Saha during the Spring '08 term at William & Mary.

Page1 / 16

Chapter 17 Study Questions--answers at end - CHAPTER 17...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online