Viruses are obligate parasitic organisms that show signs of life only inside a host. Outside the host, they either die or do not show any sign of life. They invade the host cell to carry out their function like replication. Depending upon the state of the virus, it can carry out lytic cycle or lysogenic cycle.

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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 13, Problem 5MC

Summary Introduction

Introduction:

Viruses are obligate parasitic organisms that show signs of life only inside a host. Outside the host, they either die or do not show any sign of life. They invade the host cell to carry out their function like replication. Depending upon the state of the virus, it can carry out lytic cycle or lysogenic cycle.

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An experimental drug therapy to treat patients with antibiotic-resistant bacteria involves introduction of a highly specific bacteriophage to the infected patient's bloodstream. Which of the following bacteriophage types would be the LEAST useful for this therapy? a. a lytic bacteriophage b. An enveloped virus c. An RNA virus d. a lysogenic bacteriophage

A researcher, studying two different animal viruses (A and B) that infect the same cell type, digests away all the protein and transfers the nucleic acid directly into the host cell. Only virus B causes the infection. This suggests: a. Virus A is likely to be a naked virus. b. Virus A is likely to be an enveloped virus. c. Virus A is likely to be a -ssRNA virus. d. Virus A is likely to be a +ssRNA virus. e. Virus A is likely to be a dsDNA virus. And now explain why.

A virus is isolated, and individual virions appear spherical. What type of virus is this? A. Bacteriophage B. Helical C. Icosahedral D. Lysogenic

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 13, Problem 5MC

Summary Introduction

Introduction:

Viruses are obligate parasitic organisms that show signs of life only inside a host. Outside the host, they either die or do not show any sign of life. They invade the host cell to carry out their function like replication. Depending upon the state of the virus, it can carry out lytic cycle or lysogenic cycle.

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Answer 3

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 13, Problem 5MC

Summary Introduction

Introduction:

Viruses are obligate parasitic organisms that show signs of life only inside a host. Outside the host, they either die or do not show any sign of life. They invade the host cell to carry out their function like replication. Depending upon the state of the virus, it can carry out lytic cycle or lysogenic cycle.

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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 13, Problem 5MC

Summary Introduction