Bacteria are involved in associations with groups of other species. These types of associations are called as symbiotic association. Some prokaryotes are in beneficial or mutualistic association with other species in which both are benefitted from each other. Some are in parasitic association with other organisms in which the host is harmed by the parasites.

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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 25, Problem 9TYU

Summary Introduction

Introduction: Bacteria are involved in associations with groups of other species. These types of associations are called as symbiotic association. Some prokaryotes are in beneficial or mutualistic association with other species in which both are benefitted from each other. Some are in parasitic association with other organisms in which the host is harmed by the parasites.

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Mycorrhizas represent associations between plant roots andmicroorganisms thata) are antagonistic.b) help plants take up phosphorus and other nutrients from soil.c) involve algae in the association with plant roots.d) form nodules on the plant’s leaves.e) lead to the production of antibiotics.

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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 25, Problem 9TYU

Summary Introduction

Introduction: Bacteria are involved in associations with groups of other species. These types of associations are called as symbiotic association. Some prokaryotes are in beneficial or mutualistic association with other species in which both are benefitted from each other. Some are in parasitic association with other organisms in which the host is harmed by the parasites.

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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 25, Problem 9TYU

Summary Introduction

Introduction: Bacteria are involved in associations with groups of other species. These types of associations are called as symbiotic association. Some prokaryotes are in beneficial or mutualistic association with other species in which both are benefitted from each other. Some are in parasitic association with other organisms in which the host is harmed by the parasites.

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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 25, Problem 9TYU

Summary Introduction