The way through which a highly infectious strain of the virus that targets and destroys neurons might be changed so that it could deliver a gene to correct cystic fibrosis in lung tissue. Introduction: Viruses are intracellular obligate parasites that require a host cell to proliferate. They take over the machinery of the host cell that it infects and reproduces within the host cell. They possess either DNA or RNA genome, which is surrounded by the protein capsid.

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 26, Problem 4S

Summary Introduction

To explain: The way through which a highly infectious strain of the virus that targets and destroys neurons might be changed so that it could deliver a gene to correct cystic fibrosis in lung tissue.

Introduction: Viruses are intracellular obligate parasites that require a host cell to proliferate. They take over the machinery of the host cell that it infects and reproduces within the host cell. They possess either DNA or RNA genome, which is surrounded by the protein capsid.

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Some retroviruses that have a wide host range have been developed for use in treatment of diseases or syndromes. These viruses do not result in a productive infection because they lack critical genes for viral replication, but they do carry DNA sequences that allow them to be packaged into infectious particles. Once in the host cell the viral DNA is released and integrates into the cell's genome. The advantage to this strategy is that the delivery of the DNA is very efficient. What is one possible problem of using a virus that can integrate into the human nuclear genome? Multiple Choice The virus carries genes that will interfere with host cell activities. The viral DNA sequences could still cause a disease. Since the viral DNA sequences no longer contain essential genes for viral replication the host cell may not be able to replicate either. The integration could disrupt an essential gene or genes.

Which of the following is a known characteristic that can lead to genetic changes in some viruses? Operons in the viral genome can undergo homologous recombination, leading to genetic rearrangements. Reassortment of segmented genomes can occur if a host cell is co-infected with two different viral strains. RNA polymerases used in replication of the viral genome have proofreading capability. Environmental conditions can trigger the SOS response, which triggers mutations in the viral genome.

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

Answer 2

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 26, Problem 4S

Summary Introduction

To explain: The way through which a highly infectious strain of the virus that targets and destroys neurons might be changed so that it could deliver a gene to correct cystic fibrosis in lung tissue.

Introduction: Viruses are intracellular obligate parasites that require a host cell to proliferate. They take over the machinery of the host cell that it infects and reproduces within the host cell. They possess either DNA or RNA genome, which is surrounded by the protein capsid.

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Answer 3

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Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 26, Problem 4S

Summary Introduction

To explain: The way through which a highly infectious strain of the virus that targets and destroys neurons might be changed so that it could deliver a gene to correct cystic fibrosis in lung tissue.

Introduction: Viruses are intracellular obligate parasites that require a host cell to proliferate. They take over the machinery of the host cell that it infects and reproduces within the host cell. They possess either DNA or RNA genome, which is surrounded by the protein capsid.

Expert Solution & Answer

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Check out a sample textbook solution

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Answer 4

Question

Definition Definition Organism that lives in the body of another organism and obtains food at the expense of the host. A parasite can directly or indirect harm the host. There are two kinds of parasites: internal and external. An internal parasite lives inside another organism and is known as an endoparasite. An external parasite lives on the body surface of the host and is known as an ectoparasite. Protozoa and helminths are examples of major human parasites.

Chapter 26, Problem 4S

Summary Introduction