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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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

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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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Check out a sample textbook solution

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Answer 4

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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