Genetics: Operon 1. Predict the effect of each situation on the Lac or Trp operon.Lac operon is ONLac operon is OFFSUE.CUE.Trp operon is ONDUE.HUE.Trp operon is OFFa. Tryptophan levels are highb. LacZ is mutatedc. TrpR is mutatedd. LacO is mutatede. Culture medium is fortified with lactosef. E. coli has enough stored ATP

Operon is the group of genes that are expressed under the same regulatory sequences.

1. Predict the effect of each situation on the Lac or Trp operon. Lac operon is ON Lac operon is OFF Trp operon is ON Trp operon is OFF SUE. CUE. DUE. HUE. a. Tryptophan levels are high b. LacZ is mutated c. TrpR is mutated d. LacO is mutated e. Culture medium is fortified with lactose f. E. coli has enough stored ATP

1. Predict the effect of each situation on the Lac or Trp operon. Lac operon is ON Lac operon is OFF Trp operon is ON Trp operon is OFF SUE. CUE. DUE. HUE. a. Tryptophan levels are high b. LacZ is mutated c. TrpR is mutated d. LacO is mutated e. Culture medium is fortified with lactose f. E. coli has enough stored ATP

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter16: Regulation Of Gene Expression

Section: Chapter Questions

Problem 3TYK

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1. (a) Lactose levels are high Lac Operon Genes are switched OFF Lac Operon Genes are switched ON Does NOT affect the gene expression (b) Enhancer and activator proteins are working together Gene is switched ON Gene is switched OFF Does NOT affect the gene expression
1) Assume you have an operon that is repressible. In this case, the rate of synthesis of repressor protein must depend on the level of a) co-repressor b) inducer c) both d) neither
The trp operon in E. coli is a negative repressible operon. This implies that... a. The trp operon makes use of an activator and can be turned "on" (i.e., is normally "off") b. The trp operon makes use of an activator and can be turned "off" (i.e., is normally "on) c. The trp operon makes use of a repressor and can be turned "on" (i.e., is normally "off") d. The trp operon makes use of a repressor and can be turned "off" (i.e., is normally "on") e. None of the above
What type of operon is arabinose operon? Dose the repressor bond when arabinose is I present or absent in the medium? Indiuclr and absent Inaudible and present Repressible and absent Repressible and present A b c d which answer help asap
What is an operon?a. A site in the DNA where a regulatory protein bindsb. A group of genes under the control of a single promoterc. An mRNA that encodes several genesd. All of the above are true of an operon.
In the txp operon, a repressor protein acquires a mutation such that it cannot bind to tryptophan. What will be the effect on the trp operon? 1. turned off permanently 2. turned on permanenty 3. constitutive4. a and c5. b and c
4. What are the effects of the following conditions on Lac operon of bacteria?A)Glucose is absent and lactose is presentB)Glucose is present and lactose is presentC) Glucose is present and lactose is absent
The lac operon is usually in the ________ position and is activatedby a/an ________ molecule.a. on, repressor b. off, inducer c. on, inducer d. off, repressor
A mutation that inactivates the repressor gene of the lac operon results in (a) the continuous transcription of the structural genes (b) no transcription of the structural genes (c) the binding of the repressor to the operator (d) no production of RNA polymerase (e) no difference in the rate of transcription
Which of the following is characteristic of genes and gene regulation in both bacteria and eukaryotes? (a) promoters (b) non-coding DNA within coding sequences (c) enhancers (d) operons (e) DNA located in a nucleus
Figure 16.5 In E. coli, the tip operon is on by default, while the lac operon is off. Why do you think that this is the case?
For the E. coli lac operon, when lactose is present: a. and glucose is absent, cAMP binds and activates catabolicactivator protein (CAP). b. and glucose is absent, the level of cAMP decreases. c. activated CAP binds the repressor protein to remove it from the operator gene. d. the cell prefers lactose over glucose. e. RNA polymerase cannot bind to the promoter.