Question

Any structure, protein, or property of a microorganism that is used to cause disease is considered a…

Question 52 options:

	Antigen
	Enzyme
	Virulence factor
	Toxin

Question 53 (1.25 points)

A pure culture can best be defined as...

Question 53 options:

	Sterile media
	Streaking an agar plate for isolated colonies
	One species of microorganism grown on solid media or in liquid media
	A special type of media that can only grow one type of microorganism

Question 54 (1.25 points)

Which of the following statements describing the different types of microorganisms is FALSE?

Question 54 options:

	Fungi are eukaryotic organisms that consist of molds, mushrooms, & yeast
	Parasites live in or on another organism in a non-mutual relationship
	Bacteria are single celled organisms capable of independent metabolism
	Algae are not capable of independent metabolism

Selective toxicity can BEST be defined as…

Question 56 options:

	The ability of a drug to kill the pathogen regardless of side effects to the host cells
	The ability of a drug to kill Gram-positive but not Gram-negative bacteria
	The ability of a drug to kill pathogens but leave normal flora and non-pathogens unharmed
	The ability of a drug to target a pathogen but leave host cells relatively unharmed

Question 57 (1.25 points)

A biofilm is defined as…

Question 57 options:

	A community of a single species of bacteria
	A movie about biology
	A community of microbial cells surrounded by a polysaccharide, protein, & nucleic acid matrix
	A layer of polysaccharides that surrounds bacterial cells

Answer 1

Any structure, protein, or property of a microorganism that is used to cause disease is considered a…

Answer- Antigen

The antigen is any part of microorganisms, which when entering in body and binds with antibodies and initiate an immune response. Macrophage engulfs the microorganism which enters the body and phagocytes it and places it on its surface and acts like an antigen-presenting cell.

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