A type of RNA virus that inserts a copy of its genome into the DNA of an invaded host cell is called a retrovirus. Thereby, it changes the genome of the host cell. These viruses are composed only of RNA and not DNA. They possess specific enzymes that provide them the unique characteristics.

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Answer 1

Question

Chapter 26, Problem 1U

Summary Introduction

Introduction: A type of RNA virus that inserts a copy of its genome into the DNA of an invaded host cell is called a retrovirus. Thereby, it changes the genome of the host cell. These viruses are composed only of RNA and not DNA. They possess specific enzymes that provide them the unique characteristics.

Expert Solution & Answer

Answer to Problem 1U

Correct answer: b. Because host cells’ genomes do not contain a gene encoding an enzyme that can make DNA from RNA.

Explanation of Solution

Reason for the correct answer:

Retroviruses possess the reverse transcriptase enzyme. This is because the genome of the host cell does not possess a gene encoding an enzyme that could convert DNA from RNA. The reverse transcriptase enzyme converts RNA genome into DNA.

Option b. is given as “Because host cells’ genomes do not contain a gene encoding an enzyme that can make DNA from RNA”.

Hence, the correct answer is option b.

Reasons for the incorrect answers:

Option a. is given as “because host cells make DNA from RNA only in G2 of the cell cycle, and HIV infects only during G1 of the cell cycle”.

This is not an appropriate option that describes the function of reverse transcriptase enzyme in the retrovirus. Therefore, option a. is incorrect.

Option c. is given as “Because HIV deletes large parts of the host cell genome upon infection, and that means there is a chance that host cell reverse transcriptase will be deleted”.

The presence of reverse transcriptase in retroviruses facilitates reverse transcription of RNA into DNA. Therefore, option c. is incorrect.

Option d. is given as “Host cells cannot make RNA from DNA”.

This is not an appropriate option for the necessity of the presence of the reverse transcriptase enzyme in a retrovirus. Therefore, option d. is incorrect.

Hence, options a., c., and d. are incorrect.

Conclusion

Thus, the reason for the need of retroviruses to contain the reverse transcriptase enzyme is that it would facilitate the reverse transcription of RNA into DNA.

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Students have asked these similar questions

a. How are viral envelopes formed? Why are enveloped viruses that infect plants and bacteria rare? b. Outline the life cycle options of a temperate phage upon entering a host cell. c. Consider the 5 steps of a virus life cycle. List three structures and/or processes that are unique to viruses and would make good drug targets for an antiviral agent. Explain your rationale for each choice.

Coronaviruses 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.

Why are vaccines and/or passive immunization the method of choice in the treatment or prevention of viral infections? A. There are no known inhibitors to reverse transcription B. Viruses are non-living and do not have their own genetic mechanisms to reproduce by themselves hence host cells must rely on targeting the virus or their products. C. Antibodies prevent replication of viral genome D. Antibodies prevent transcription and translation of viral genomes E. All of these

Answer 2

Question

Chapter 26, Problem 1U

Summary Introduction

Introduction: A type of RNA virus that inserts a copy of its genome into the DNA of an invaded host cell is called a retrovirus. Thereby, it changes the genome of the host cell. These viruses are composed only of RNA and not DNA. They possess specific enzymes that provide them the unique characteristics.

Expert Solution & Answer

Answer to Problem 1U

Correct answer: b. Because host cells’ genomes do not contain a gene encoding an enzyme that can make DNA from RNA.

Explanation of Solution

Reason for the correct answer:

Retroviruses possess the reverse transcriptase enzyme. This is because the genome of the host cell does not possess a gene encoding an enzyme that could convert DNA from RNA. The reverse transcriptase enzyme converts RNA genome into DNA.

Option b. is given as “Because host cells’ genomes do not contain a gene encoding an enzyme that can make DNA from RNA”.

Hence, the correct answer is option b.

Reasons for the incorrect answers:

Option a. is given as “because host cells make DNA from RNA only in G2 of the cell cycle, and HIV infects only during G1 of the cell cycle”.

This is not an appropriate option that describes the function of reverse transcriptase enzyme in the retrovirus. Therefore, option a. is incorrect.

Option c. is given as “Because HIV deletes large parts of the host cell genome upon infection, and that means there is a chance that host cell reverse transcriptase will be deleted”.

The presence of reverse transcriptase in retroviruses facilitates reverse transcription of RNA into DNA. Therefore, option c. is incorrect.

Option d. is given as “Host cells cannot make RNA from DNA”.

This is not an appropriate option for the necessity of the presence of the reverse transcriptase enzyme in a retrovirus. Therefore, option d. is incorrect.

Hence, options a., c., and d. are incorrect.

Conclusion

Thus, the reason for the need of retroviruses to contain the reverse transcriptase enzyme is that it would facilitate the reverse transcription of RNA into DNA.

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Answer 3

Question

Chapter 26, Problem 1U

Summary Introduction

Introduction: A type of RNA virus that inserts a copy of its genome into the DNA of an invaded host cell is called a retrovirus. Thereby, it changes the genome of the host cell. These viruses are composed only of RNA and not DNA. They possess specific enzymes that provide them the unique characteristics.

Expert Solution & Answer

Answer to Problem 1U

Correct answer: b. Because host cells’ genomes do not contain a gene encoding an enzyme that can make DNA from RNA.

Explanation of Solution

Reason for the correct answer:

Retroviruses possess the reverse transcriptase enzyme. This is because the genome of the host cell does not possess a gene encoding an enzyme that could convert DNA from RNA. The reverse transcriptase enzyme converts RNA genome into DNA.

Option b. is given as “Because host cells’ genomes do not contain a gene encoding an enzyme that can make DNA from RNA”.

Hence, the correct answer is option b.

Reasons for the incorrect answers:

Option a. is given as “because host cells make DNA from RNA only in G2 of the cell cycle, and HIV infects only during G1 of the cell cycle”.

This is not an appropriate option that describes the function of reverse transcriptase enzyme in the retrovirus. Therefore, option a. is incorrect.

Option c. is given as “Because HIV deletes large parts of the host cell genome upon infection, and that means there is a chance that host cell reverse transcriptase will be deleted”.

The presence of reverse transcriptase in retroviruses facilitates reverse transcription of RNA into DNA. Therefore, option c. is incorrect.

Option d. is given as “Host cells cannot make RNA from DNA”.

This is not an appropriate option for the necessity of the presence of the reverse transcriptase enzyme in a retrovirus. Therefore, option d. is incorrect.

Hence, options a., c., and d. are incorrect.

Conclusion

Thus, the reason for the need of retroviruses to contain the reverse transcriptase enzyme is that it would facilitate the reverse transcription of RNA into DNA.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 4

Question

Chapter 26, Problem 1U

Summary Introduction

Introduction: A type of RNA virus that inserts a copy of its genome into the DNA of an invaded host cell is called a retrovirus. Thereby, it changes the genome of the host cell. These viruses are composed only of RNA and not DNA. They possess specific enzymes that provide them the unique characteristics.

Expert Solution & Answer

Answer to Problem 1U

Correct answer: b. Because host cells’ genomes do not contain a gene encoding an enzyme that can make DNA from RNA.

Explanation of Solution

Reason for the correct answer:

Retroviruses possess the reverse transcriptase enzyme. This is because the genome of the host cell does not possess a gene encoding an enzyme that could convert DNA from RNA. The reverse transcriptase enzyme converts RNA genome into DNA.

Option b. is given as “Because host cells’ genomes do not contain a gene encoding an enzyme that can make DNA from RNA”.

Hence, the correct answer is option b.

Reasons for the incorrect answers:

Option a. is given as “because host cells make DNA from RNA only in G2 of the cell cycle, and HIV infects only during G1 of the cell cycle”.

This is not an appropriate option that describes the function of reverse transcriptase enzyme in the retrovirus. Therefore, option a. is incorrect.

Option c. is given as “Because HIV deletes large parts of the host cell genome upon infection, and that means there is a chance that host cell reverse transcriptase will be deleted”.

The presence of reverse transcriptase in retroviruses facilitates reverse transcription of RNA into DNA. Therefore, option c. is incorrect.

Option d. is given as “Host cells cannot make RNA from DNA”.

This is not an appropriate option for the necessity of the presence of the reverse transcriptase enzyme in a retrovirus. Therefore, option d. is incorrect.

Hence, options a., c., and d. are incorrect.

Conclusion

Thus, the reason for the need of retroviruses to contain the reverse transcriptase enzyme is that it would facilitate the reverse transcription of RNA into DNA.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Chapter 26, Problem 1U

Summary Introduction

Introduction: A type of RNA virus that inserts a copy of its genome into the DNA of an invaded host cell is called a retrovirus. Thereby, it changes the genome of the host cell. These viruses are composed only of RNA and not DNA. They possess specific enzymes that provide them the unique characteristics.

Expert Solution & Answer

Answer to Problem 1U

Correct answer: b. Because host cells’ genomes do not contain a gene encoding an enzyme that can make DNA from RNA.

Explanation of Solution

Reason for the correct answer:

Retroviruses possess the reverse transcriptase enzyme. This is because the genome of the host cell does not possess a gene encoding an enzyme that could convert DNA from RNA. The reverse transcriptase enzyme converts RNA genome into DNA.

Option b. is given as “Because host cells’ genomes do not contain a gene encoding an enzyme that can make DNA from RNA”.

Hence, the correct answer is option b.

Reasons for the incorrect answers:

Option a. is given as “because host cells make DNA from RNA only in G2 of the cell cycle, and HIV infects only during G1 of the cell cycle”.

This is not an appropriate option that describes the function of reverse transcriptase enzyme in the retrovirus. Therefore, option a. is incorrect.

Option c. is given as “Because HIV deletes large parts of the host cell genome upon infection, and that means there is a chance that host cell reverse transcriptase will be deleted”.

The presence of reverse transcriptase in retroviruses facilitates reverse transcription of RNA into DNA. Therefore, option c. is incorrect.

Option d. is given as “Host cells cannot make RNA from DNA”.

This is not an appropriate option for the necessity of the presence of the reverse transcriptase enzyme in a retrovirus. Therefore, option d. is incorrect.

Hence, options a., c., and d. are incorrect.

Conclusion

Thus, the reason for the need of retroviruses to contain the reverse transcriptase enzyme is that it would facilitate the reverse transcription of RNA into DNA.

Answer 6

Chapter 26, Problem 1U

Summary Introduction

Introduction: A type of RNA virus that inserts a copy of its genome into the DNA of an invaded host cell is called a retrovirus. Thereby, it changes the genome of the host cell. These viruses are composed only of RNA and not DNA. They possess specific enzymes that provide them the unique characteristics.

Expert Solution & Answer

Answer to Problem 1U

Correct answer: b. Because host cells’ genomes do not contain a gene encoding an enzyme that can make DNA from RNA.

Explanation of Solution

Reason for the correct answer:

Retroviruses possess the reverse transcriptase enzyme. This is because the genome of the host cell does not possess a gene encoding an enzyme that could convert DNA from RNA. The reverse transcriptase enzyme converts RNA genome into DNA.

Option b. is given as “Because host cells’ genomes do not contain a gene encoding an enzyme that can make DNA from RNA”.

Hence, the correct answer is option b.

Reasons for the incorrect answers:

Option a. is given as “because host cells make DNA from RNA only in G2 of the cell cycle, and HIV infects only during G1 of the cell cycle”.

This is not an appropriate option that describes the function of reverse transcriptase enzyme in the retrovirus. Therefore, option a. is incorrect.

Option c. is given as “Because HIV deletes large parts of the host cell genome upon infection, and that means there is a chance that host cell reverse transcriptase will be deleted”.

The presence of reverse transcriptase in retroviruses facilitates reverse transcription of RNA into DNA. Therefore, option c. is incorrect.

Option d. is given as “Host cells cannot make RNA from DNA”.

This is not an appropriate option for the necessity of the presence of the reverse transcriptase enzyme in a retrovirus. Therefore, option d. is incorrect.

Hence, options a., c., and d. are incorrect.

Conclusion

Thus, the reason for the need of retroviruses to contain the reverse transcriptase enzyme is that it would facilitate the reverse transcription of RNA into DNA.

Answer 7

Chapter 26, Problem 1U

Summary Introduction

Introduction: A type of RNA virus that inserts a copy of its genome into the DNA of an invaded host cell is called a retrovirus. Thereby, it changes the genome of the host cell. These viruses are composed only of RNA and not DNA. They possess specific enzymes that provide them the unique characteristics.

Answer 8

Expert Solution & Answer

Answer to Problem 1U

Correct answer: b. Because host cells’ genomes do not contain a gene encoding an enzyme that can make DNA from RNA.

Answer 9

Expert Solution & Answer

Answer 10

Expert Solution & Answer

Answer 11

Explanation of Solution

Reason for the correct answer:

Retroviruses possess the reverse transcriptase enzyme. This is because the genome of the host cell does not possess a gene encoding an enzyme that could convert DNA from RNA. The reverse transcriptase enzyme converts RNA genome into DNA.

Option b. is given as “Because host cells’ genomes do not contain a gene encoding an enzyme that can make DNA from RNA”.

Hence, the correct answer is option b.

Reasons for the incorrect answers:

Option a. is given as “because host cells make DNA from RNA only in G2 of the cell cycle, and HIV infects only during G1 of the cell cycle”.

This is not an appropriate option that describes the function of reverse transcriptase enzyme in the retrovirus. Therefore, option a. is incorrect.

Option c. is given as “Because HIV deletes large parts of the host cell genome upon infection, and that means there is a chance that host cell reverse transcriptase will be deleted”.

The presence of reverse transcriptase in retroviruses facilitates reverse transcription of RNA into DNA. Therefore, option c. is incorrect.

Option d. is given as “Host cells cannot make RNA from DNA”.

This is not an appropriate option for the necessity of the presence of the reverse transcriptase enzyme in a retrovirus. Therefore, option d. is incorrect.

Hence, options a., c., and d. are incorrect.

Answer 12

Conclusion

Thus, the reason for the need of retroviruses to contain the reverse transcriptase enzyme is that it would facilitate the reverse transcription of RNA into DNA.

Answer 13

Ch. 26.1 - Prob. 1LO Ch. 26.1 - Prob. 2LO Ch. 26.2 - Prob. 1LO Ch. 26.2 - Prob. 2LO Ch. 26.3 - Prob. 1LO Ch. 26.3 - Describe how viruses can contribute DNA to their...Ch. 26.4 - Describe the differences between acute and...Ch. 26.4 - Prob. 2LO Ch. 26.4 - Prob. 3LO Ch. 26.5 - Prob. 1LO

A type of RNA virus that inserts a copy of its genome into the DNA of an invaded host cell is called a retrovirus. Thereby, it changes the genome of the host cell. These viruses are composed only of RNA and not DNA. They possess specific enzymes that provide them the unique characteristics.

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