Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 12, Problem 6TY
Summary Introduction
Introduction:
In E.coli, lac operon is present that contains genes required for the
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When an individual drink's a product with lactose (e.g., whole milk), what happens to the repressor system of the lac operon?
The lac repressor is inactivated
Transcription of the lac operon genes into a single mRNA
β-galactosidase and lac permease are synthesized
Lactose is rapidly metabolized by enzymes
For the lac operon, determine whether genes will be expressed (on) or silenced (off) given the following:
a. Lactose levels are high, glucose is low.
b. The lac repressor can no longer bind DNA; lactose and glucose are low.
Describe the regulation of the lac operon when lactose is present and glucose is present
Your Response must include the following terms, cAMP, inactive CAP, active CAP promoter, operator, RNA polymerase, CAP binding site
Chapter 12 Solutions
Principles of Biology
Ch. 12.1 - How does gene regulation underlie the different...Ch. 12.1 - Prob. 1TYKCh. 12.1 - The most common point of gene regulation in...Ch. 12.2 - Which genes are under the control of the lac...Ch. 12.2 - Prob. 2CCCh. 12.2 - Prob. 1BCCh. 12.2 - Prob. 1TYKCh. 12.3 - Prob. 1CCCh. 12.3 - Prob. 1TYKCh. 12.3 - Prob. 2TYK
Ch. 12.4 - Prob. 1CCCh. 12.4 - Prob. 1BCCh. 12.4 - A chromatin-remodeling complex may change the...Ch. 12.4 - Prob. 2TYKCh. 12.5 - What is the biological advantage of alternative...Ch. 12.5 - Prob. 2CCCh. 12.5 - Prob. 1TYKCh. 12.5 - Prob. 2TYKCh. 12 - Genes that are expressed at all times at...Ch. 12 - Prob. 2TYCh. 12 - Transcription factors that bind to DNA and...Ch. 12 - Prob. 4TYCh. 12 - Prob. 5TYCh. 12 - Prob. 6TYCh. 12 - Prob. 7TYCh. 12 - Prob. 8TYCh. 12 - Prob. 9TYCh. 12 - Prob. 10TYCh. 12 - What is the difference between inducible and...Ch. 12 - Transcriptional regulation often involves a...Ch. 12 - PRINCIPLES A principle of biology is that the...Ch. 12 - Discuss the advantages and disadvantages of...Ch. 12 - Prob. 2CBQ
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- The tryptophan (trp) operon is a repressible system. This means the genes are normally expressed, but the presence of trp can repress the operon the genes are normally repressed the genes are normally expressed when trp is present the genes are normally repressed, but the presence of trp can activate the genesarrow_forwardA mutation in the lac operator that prevents binding of the lac repressor to the operator What is the correct option from the choices below? renders the lac operon transcriptionally inactive. leads to constitutive expression of the lac operon. affects the interaction between the lac repressor and allolactose. affects the interaction between CAP and cAMP. none of the abovearrow_forwardIn your own words describe in detail what happens at the lac operon in each of the following situations Lactose, no glucose (high cAMP) No lactose or glucose (high cAMP) Lactose and glucose (low cAMP) Glucose, no lactose (low cAMP)arrow_forward
- Bacteria is grown on a media containing only lactose. Given below is the diagram of lac operon. I have to label the diagram and it says mark promoter, operator, RNA polymerase, functional genes, repressed gene,repressor, lactose mRNA, how does this operon function in the presence of lactose.arrow_forwardIf glucose is absent, but lactose is available, the lac operon will be _______ A. activated B. repressed C. activated, but only partially D. mutatedarrow_forwardIn order for the lac operon to be triggered, lactose must be present and ________. a. cAMP levels low b. glucose stores depleted c. glucose levels higharrow_forward
- A mutation in the lac I gene that prevents production of the lac repressor choose an answer below: renders the lac operon transcriptionally inactive. leads to constitutive expression of the lac operon. leads to constitutive expression of the trp operon. abolishes the effect of glucose on the transcription of the lac operon. none of the abovearrow_forwardIf glucose is absent, but so is lactose, the lac operon will be ________. a. activated b. repressed c. activated, but only partially d. mutatedarrow_forwardWhat 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 asaparrow_forward
- 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, repressorarrow_forwardTranscription of structural genes in an inducible operon ______. A) starts when the pathway’s substrate is present B) occurs continuously in the cell C) starts when the pathway’s product is presentarrow_forwardWhich of the following molecules is an inducer of the lac operon:a. Galactose d. Isothiocyanateb. Glucose e. cAMPc. Allolactose f. Lactosearrow_forward
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