Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 18, Problem 19CONQ
Summary Introduction
To review:
The requirement of host cell-transfer ribonucleic acid (tRNA) for reverse transcription.
Introduction:
Retroviruses are the virusesthat have ribonucleic acid as tehri genome, while other viruses contain deoxyribonucleic acid (DNA).Human immunodeficiency virus (HIV) is a lentivirus of the retrovirus family of the viruses.
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a)Describe the process of transcription in prokaryotes
b) Explain how proteins can be targeted for specific sites within the cell
Most bacterial repressor proteins are allosteric. Which of the following binds with the repressor to alter its conformation?
A) promoter
B) corepressor
C) ATP
Gene expression in bacteria is controlled by the operon model.
a) Why is the operon model important?
b) Why is the trp operon known as a repressible operon?
Chapter 18 Solutions
Genetics: Analysis and Principles
Ch. 18.1 - 1. What is a common feature found in all viruses?...Ch. 18.1 - 2. Viral genomes can be
a. DNA or RNA.
b....Ch. 18.2 - Prob. 1COMQCh. 18.2 - Prob. 2COMQCh. 18.3 - A mutation in phage results in 10-fold greater...Ch. 18.3 - 2. The cl gene that encodes the λ repressor has...Ch. 18.4 - A viral protein that is needed to make HIV DNA is...Ch. 18.4 - Prob. 2COMQCh. 18.4 - After HIV components are made, what is the correct...Ch. 18 - 1. Discuss why viruses are considered nonliving.
Ch. 18 - What structural features are common to all...Ch. 18 - 3. What are the similarities and differences among...Ch. 18 - Prob. 4CONQCh. 18 - Prob. 5CONQCh. 18 - Prob. 6CONQCh. 18 - Prob. 7CONQCh. 18 - Prob. 8CONQCh. 18 - Prob. 9CONQCh. 18 - Prob. 10CONQCh. 18 - 11. What is a prophage, a provirus, and an...Ch. 18 - Prob. 12CONQCh. 18 - Prob. 13CONQCh. 18 - 14. With regard to promoting the lytic or...Ch. 18 - 15. How do therepressor and the cro protein affect...Ch. 18 - Prob. 16CONQCh. 18 - Figure 18.11 shows a genetic switch that controls...Ch. 18 - Prob. 18CONQCh. 18 - Prob. 19CONQCh. 18 - Explain the role of RNase H (a component of...Ch. 18 - Prob. 21CONQCh. 18 - Prob. 22CONQCh. 18 - Prob. 23CONQCh. 18 - 24. Compare and contrast the roles of fully...Ch. 18 - 25. Describe the role of the Gag polyprotein...Ch. 18 - Prob. 26CONQCh. 18 - Prob. 27CONQCh. 18 - 1. Discuss how researchers determined that TMV is...Ch. 18 - Prob. 2EQCh. 18 - What is a reconstituted virus?Ch. 18 - Following the infection of healthy tobacco leaves...Ch. 18 - Prob. 5EQCh. 18 - Prob. 6EQCh. 18 - A researcher identified a mutation in PR of phage ...Ch. 18 - Experimentally, when an E. coli bacterium already...Ch. 18 - 9. A bacterium is exposed to a drug that inhibits...Ch. 18 - This question combines your knowledge of bacterial...Ch. 18 - Prob. 1QSDCCh. 18 - 2. Certain environmental conditions such as...Ch. 18 - 3. Browse the Internet to determine the drugs that...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- What is the effect of a mutation in the allosteric site of the Lac Repressor protein? A) The Lac Operon would always be expressed whenever glucose is absent. B) The Lac Operon would never be expressed in any environment. C) The Lac Operon would be regulated normally. D) The Lac Operon would be never be expressed in lactose but would always be expressed in glucose.arrow_forwardPresence of the heparin promotes transcription. a) True b) Falsearrow_forwardWhy is TBP considered to be a universal transcription factor?arrow_forward
- Which of the following is a possible consequence of a mutation that introduces a premature stop codon in a gene sequence? a) No transcription into an mRNA. Ob) The shortening of an mRNA transcript. c) No binding of the transcription initiation complex. d) The shortening of an amino acids sequence. e) No translation of the mRNA.arrow_forwardDescribe what would happen to the lac operon in a low-lactose environment and in a high lactose environment. a) How will each of these environments affect gene expression? b) What would happen to the repressor in each case? c) How will each of these environments affect RNA polymerase?arrow_forwardWhen tryptophan levels are high in E. coli, what conformation does the trp leader mRNA adoptand what is the effect on transcription of the rest of the trp operon?a) conformation 2, transcription continuesb) conformation 1, transcription continuesc) conformation 1, transcription stopsd) conformation 2, transcription stopsarrow_forward
- The lac operon in E. coli bacteria codes for proteins that break down (digest) the disaccharide lactose. Therefore, the lac operon is expressed at its highest levels when there is: A) glucose but no lactose B) lactose and glucose C) lactose but no glucose D) no glucose or lactosearrow_forwardWhy is formation of the replicative form of fX174 necessary inorder to make phage-specific mRNA?arrow_forwardWhat evolutionary advantage would a retrovirus gain by having the ability to regulate the sites of splicing of its RNA?arrow_forward
- What is a transducing phage?arrow_forwardWhat is the difference between the lytic and lysogenic cycle of bacteriophages? In the lysogenic cycle, the phage DNA integrates itself into the host genome after penetration, and continues to biosynthesis when conditions change The host cell is not killed in the lysogenic cycle The lytic cycle occurs in the nucleus, while the lysogenic cycle occurs in the cytoplasm In the lysogenic cycle, penetration is achieved through phagocytosisarrow_forwardM13 is a filamentous phage that infects the bacterium Escherichia coli. Infection with M13 is not lethal. However, the infection causes turbid plaques in E. coli because infected bacteria grow slower than the surrounding uninfected bacteria. This phage has been engineered to act as a vector system. Explain how the amplification of gene of interest works in this phage with illustration.arrow_forward
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