Brock Biology of Microorganisms (15th Edition)
15th Edition
ISBN: 9780134261928
Author: Michael T. Madigan, Kelly S. Bender, Daniel H. Buckley, W. Matthew Sattley, David A. Stahl
Publisher: PEARSON
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Textbook Question
Chapter 10.11, Problem 1CR
Why do both hepadnaviruses and retroviruses require reverse transcriptase when their genomes are double-stranded DNA and single-stranded RNA, respectively?
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Which of the following are the functions of reverse transcriptase in retroviruses?
i) it hydrolyzes the host cell's DNA
ii) it uses viral RNA as a template for DNA synthesis
iii) it converts host cell RNA into viral DNA
iv) it translates viral RNA into proteins
v) It uses viral RNA as a template for making complementary RNA strand
vi) It degrades RNA from DNA-RNA hybrid
Oi, iv and v
O ii, iv, v and vi
ii and iii
ii and vi
How does the role of reverse transcriptase in the replicationcycles of retroviruses and hepadnaviruses differ?
As a general rule, viruses are not considered to be alive based on several reasons. One such reason is that some viruses use RNA as their genetic material instead of DNA. Which of the five biological themes does this violate? Briefly explain why.
Chapter 10 Solutions
Brock Biology of Microorganisms (15th Edition)
Ch. 10.1 - Distinguish between a positive-strand RNA virus...Ch. 10.1 - Prob. 2MQCh. 10.1 - Prob. 3MQCh. 10.1 - Describe the classes of viruses based on their...Ch. 10.2 - Prob. 1MQCh. 10.2 - Prob. 2MQCh. 10.2 - Prob. 3MQCh. 10.2 - Prob. 1CRCh. 10.3 - Prob. 1MQCh. 10.3 - In the X174 genome, describe the difference...
Ch. 10.3 - Prob. 3MQCh. 10.3 - Describe how the genome of bacteriophage X174 is...Ch. 10.4 - In what major way does transcription of phage DNA...Ch. 10.4 - Prob. 2MQCh. 10.4 - Why can it be said that transcription of the...Ch. 10.5 - What type of genome is seen in most archaeal...Ch. 10.5 - Compared with other archaeal viruses, what are two...Ch. 10.5 - Prob. 1CRCh. 10.6 - Prob. 1MQCh. 10.6 - Prob. 2MQCh. 10.6 - Prob. 3MQCh. 10.6 - Prob. 1CRCh. 10.7 - Prob. 1MQCh. 10.7 - Prob. 2MQCh. 10.7 - Prob. 3MQCh. 10.7 - Prob. 1CRCh. 10.8 - Prob. 1MQCh. 10.8 - Prob. 2MQCh. 10.8 - How are protein synthesis and genomic replication...Ch. 10.8 - Prob. 1CRCh. 10.9 - Prob. 1MQCh. 10.9 - Prob. 2MQCh. 10.9 - Prob. 3MQCh. 10.9 - Rabies virus and poliovirus both have...Ch. 10.10 - Prob. 1MQCh. 10.10 - Prob. 2MQCh. 10.10 - Prob. 3MQCh. 10.10 - Prob. 1CRCh. 10.11 - Prob. 1MQCh. 10.11 - Prob. 2MQCh. 10.11 - How does the role of reverse transcriptase in the...Ch. 10.11 - Why do both hepadnaviruses and retroviruses...Ch. 10.12 - What type of bacteriophages are most common in the...Ch. 10.12 - Prob. 2MQCh. 10.12 - Prob. 3MQCh. 10.12 - Prob. 1CRCh. 10.13 - Prob. 1MQCh. 10.13 - Prob. 2MQCh. 10.13 - Prob. 3MQCh. 10.13 - Prob. 1CRCh. 10.14 - Prob. 1MQCh. 10.14 - Prob. 2MQCh. 10.14 - Prob. 3MQCh. 10.14 - How do bacterial viruses help prevent human...Ch. 10.15 - If viroids are circular molecules, why are they...Ch. 10.15 - Prob. 2MQCh. 10.15 - Prob. 1CRCh. 10.16 - Prob. 1MQCh. 10.16 - Prob. 2MQCh. 10.16 - Prob. 3MQCh. 10.16 - What are the similarities and differences between...Ch. 10 - Not all proteins are made from the RNA genome of...Ch. 10 - Replication of both strands of DNA in adenoviruses...Ch. 10 - Imagine that you are a researcher at a...Ch. 10 - Prob. 4AQ
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- What is the function of reverse transcriptase in retroviruses? a) It converts viral RNA into double-stranded DNA Ob) It uses viral RNA as a template for making complementary RNA strands Oc) It translates viral RNA into proteins d) It uses viral DNA as a template for RNA synthesisarrow_forwardWhy does the virus carry a reverse transcriptase enzyme?arrow_forwardA viral particle adsorbs onto a host cell membrane. It uncoats and releases its single-stranded nonsegmented nucleic acid into the cytoplasm where it is immed dependent RNA polymerase, into mRNA. It is then translated into viral structural proteins and enzymes. Which of the following virus families is most likely repre A) Herpesviridae B) Paramyxoviridae C) Parvoviridae D) Reovirius E) Retroviridaearrow_forward
- The genome of a retrovirus can integrate into the host cell genome. What gene is unique to retroviruses, and why is the protein encoded by this gene absolutely necessary for maintaining the retroviral life cycle?arrow_forwardAnswer the following regarding the varicella-zoster virus: a) the biology of the virus ( type: DNA/RNA type: single or double stranded) b) how it replicates c) life cycle of the virus (binding, fusion, reverse transcription, integration, replication, and assembly)arrow_forwardMatch each of the following replication classes of viruses with the one description that best describes it. This virus class is composed of segmented and non-segmented helical viruses that carry an RdRp within the virion into the cell. Example: Rabies virus These viruses are non- enveloped, icosahedral, have segmented genomes, and carry their own RNA-dependent RNA polymerase. The viral genome is copied following assembly. Example: Reovirus This is the only class of RNA viruses whose genome is replicated by cellular enzymes and not an RNA-dependent RNA polymerase. Cellular DNA polymerases replicate this virus's non- integrated genome, although transcription is not the initial event that takes place in the process. Example: Parvoviruses In this class of viruses, transcription occurs before genome replication because viral proteins are involved in replicating the genome. Example: Adenovirus This class of viruses forms circular DNA and creates pre- genomic RNA using host RNA polymerases.…arrow_forward
- Why is HIV called a retrovirus?arrow_forwardWhat is crystallization of a virus? What is the importance of this process?arrow_forwardCoronaviruses have a positive-sense single stranded RNA genome. a.) What is the genome replication strategy of this category of viruses? b.) How do you think this feature affects the stability of the viral genome? (hint use figure below) Mutation rates in different types of viruses. Estimates obtained for viruses belonging to the major indicated groups are shown as a function of genome size. This reveals an effect of genetic material (RNA/DNA) and genome size on viral mutation rates.arrow_forward
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