Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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If lactose and glucose are provided in the growth medium of a culture of E. coli, then
a. Both lactose and glucose are metabolized at same rate.
b. Lactose
c. CAMP-CAP complex binds CAP site.
d. Lac Operon is repressed.
e. Adenylate cyclase is activated.
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- 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.arrow_forwardA mutation occurs in the lac operon operator site such that LacI can no longer bind to the operator site. The effect that this mutation has on the cell is that a. the activity of the lac operon will not be affected. b. the cell can no longer convert lactose to glucose. c. the expression of the lac genes cannot be turned off. d. the expression of the lac genes cannot be turned on.arrow_forwardIf there is a mutation in importin that prevents it from interacting with the NLS of cargo proteins, what affect, if any, would this have on the UPR (unfolded protein response). A. Ran-GEF would bind to the importin promoting cargo entry into the nucleus and transcription of UPR response genes. B. Gene regulatory protein would not be imported into the nucleus thus preventing transcription of UPR response genes C. MRNA would not be imported into the nucleus thus preventing transcription of UPR response genes D. Ran-GTP would not be imported to the nucleus thus preventing transcription of UPR response genes E. No effect, these are completely unrelated processes.arrow_forward
- Explain how the lac operon is regulated under the following conditions. Include the following terms in your answers: Repressor, Operator, RNA polymerase, CAP site, CAP protein, Promoter A. Lactose and glucose are both present. B. Lactose and glucose are both absent. C. Lactose is present and glucose is absent.arrow_forwardCatabolite activating factor (CAP) senses and the transcription of the lac operon. A. glucose; represses B. lactose; represses C. none of the above D. cAMP; activatesarrow_forwardThe tryptophan operon is a repressible operon that is A. transcribed only when glucose is present in the growth medium B. not transcribed whenever tryptophan is plentiful in the growth medium C. permanently turned on D. turned on only when tryptophan is present in the growth mediumarrow_forward
- The lac operon is an operon that is: Group of answer choices A turned off whenever tryptophan is added to the growth medium. B permanently turned on. C turned on only when glucose is present in the growth medium. D turned off only when glucose is present in the growth medium. E turned on when lactose is present in the growth medium.arrow_forwardWhich of the following molecules will experience a large change in cytoplasmic concentration whenthe above tryptophan operon is turned on (in E. coli cells)?A. tryptophan molecules will decrease in concentrationB. lactose molecules will decrease in concentrationC. tryptophan molecules will increase in concentrationD. lactose molecules will increase in concentrationE. none of the abovearrow_forwardWhich of the following statements about the lac operon is correct? 1. lacZ, lacY and lacA proteins are translated using the same RNA molecule. 2. Lacl is a gene that codes for allolactose. 3. Allolactose activates transcription of lacz, lacY and lacA. 4. In the presence of lactose, the repressor is active. A. 1, 2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1, 2, 3, and 4 are correct.arrow_forward
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