Biology: The Unity and Diversity of Life
15th Edition
ISBN: 9780357093795
Author: STARR
Publisher: CENGAGE LEARNING (CUSTOM)
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Chapter 10, Problem 13SQ
Summary Introduction
Concept introduction: Operons are the set of genes containing a promoter and one or more operator that helps to control the transcription process. A type of operon called lac operon which can occur in the bacteria is used to
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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
Which of the following is true of operons?a. They consist of a coordinated set of genes, all of which are regulated as a single unit.b. They may be inducible or repressible.c. Only bacteria and archaea utilize operons.d. All of the above are true.
d. give an example of an operon that is under negative control
e. repressor
f. give an example of a repressor molecule
g. activator
h. give an example of an activator
Chapter 10 Solutions
Biology: The Unity and Diversity of Life
Ch. 10 - Effect of Paternal Grandmother's Food Supply on...Ch. 10 - Effect of Paternal Grandmother's Food Supply on...Ch. 10 - Effect of Paternal Grandmother's Food Supply on...Ch. 10 - Gene expression does not vary by ___ . a. cell...Ch. 10 - Binding or ___ to ___ in DNA can increase the rate...Ch. 10 - Muscle cells differ from bone cells because they...Ch. 10 - Prob. 4SQCh. 10 - Mechanisms that govern gene expression do not...Ch. 10 - Prob. 6SQCh. 10 - Prob. 7SQ
Ch. 10 - Prob. 8SQCh. 10 - Which of the following includes all of the others?...Ch. 10 - Prob. 10SQCh. 10 - Prob. 11SQCh. 10 - A cell with a Barr body is ___ . a. a bacterium b....Ch. 10 - Prob. 13SQCh. 10 - Which of the following statements is incorrect? a....Ch. 10 - Prob. 15SQCh. 10 - Explain why somebut not allof an organism's genes...Ch. 10 - Do the same mechanisms that govern gene expression...Ch. 10 - Prob. 3CTCh. 10 - The photos below show flowers from two Arabidopsis...
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- What is an operon ? a. A series of genes controlled by the same operator b. A series of genes on the same mRNA molecule c. A series of genes that all have the same function d. A series of genes all regulated by the same repressorarrow_forwardIn a bacterial operon, the active repressor bind to the A. promoter. B. terminator. C. operator. D. regulator.arrow_forwardWhich of the following statements about gene regulation is false? a. An operon contains DNA sequences that regulates its own expression. b. The operator region can only be bound by an activator protein. c. Transcription factors can affect the binding of RNA polymerase to the promoter. d. A repressor is a transcription factor that hinders gene transcription.arrow_forward
- 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 carrow_forwardThe gad operon is controlled by a number of transcription factors that regulate a promoter of approximately 450bp. Which would NOT explain why bacterial promoters are shorter than the typical eukaryotic promoter? a. Bacteria do not have nucleosomes b. Bacteria do not have mediator complex c. Each operon is regulated by only one signal d. All of the above are truearrow_forwardWhich 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 nucleusarrow_forward
- A drug inhibits positive regulation of an operon. What is the most likely outcome? a. No mRNA transcription. b. Inhibition of the operon. c. Only a small amount of the protein will be synthesized. d. a and b e. a, b, and c asap , typed onlyarrow_forwardWhat 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.arrow_forwardWhat would occur if the repressor of an inducible operon weremutated so it could not bind the operator?(A) irreversible binding of the repressor to the promoter(B) reduced transcription of the operon’s genes(C) buildup of a substrate for the pathway controlled by theoperon(D) continuous transcription of the operon’s genesarrow_forward
- How do repressors reduce transcription of an operon? A) recruit RNA polymerase to promoters B) block the ability of RNA polymerase to bind a promoter C) break phosphodiester bonds in the DNA D) inhibit the activity of the ribosomearrow_forward1) 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) neitherarrow_forwardThe experimental growth of an eye on the leg of a fruit fly is most famous for providing direct evidence that________ Select one: a. proteins are involved making eyes b. genes are involved in making eyes c. one operon can control many genes d. genes are regulated via negative feedback e. that one transcriptional factor can regulate many genesarrow_forward
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