Medical Microbiology Unit 3 Lesson 4 Exam
Questions and Answers
1. bacteriocin correct answer: a chemical that is toxic and has the potential to kill bacteria
2. gut flora correct answer: a complex microbial community that lives in the human digestive tract
3. nonpathogenic correct answer: a class of microorganisms that do not cause harm to human
health
4. opportunistic pathogens correct answer: microbes that are able to cause disease when the
conditions are right
5. probiotic correct answer: a substance used to stimulate the growth of bacteria
6. virulence factors correct answer: unique features in a microbe that can help it cause disease
7. 1) Match the definitions with the terms.
a complex microbial community that lives in the human digestive
tract a substance that kills bacteria
microbes that cause disease under specified conditions
unique features that contribute to a microbe's ability to cause disease
correct answer: Gut Flora Bacteriocin
Opportunistic Pathogens
Virulence Factors
8. 2) Select the best answer.
Why are virulence factors a contributor to pathogenicity? correct answer: They
help bacteria survive in nonfavorable conditions.
9. 3) Select the best answer.
What is the purpose of a probiotic? correct answer: to keep bacterial colonies stable
and balanced
10. 4) Select the best answer.
How are gut flora beneficial to the body? correct answer: NOT "They help the pancreas
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Questions and Answers
1. bacteriocin correct answer: a chemical that is toxic and has the potential to kill bacteria
2. gut flora correct answer: a complex microbial community that lives in the human digestive tract
3. nonpathogenic correct answer: a class of microorganisms that do not cause harm to human
health
4. opportunistic pathogens correct answer: microbes that are able to cause disease when the
conditions are right
5. probiotic correct answer: a substance used to stimulate the growth of bacteria
6. virulence factors correct answer: unique features in a microbe that can help it cause disease
7. 1) Match the definitions with the terms.
a complex microbial community that lives in the human digestive
tract a substance that kills bacteria
microbes that cause disease under specified conditions
unique features that contribute to a microbe's ability to cause disease
correct answer: Gut Flora Bacteriocin
Opportunistic Pathogens
Virulence Factors
8. 2) Select the best answer.
Why are virulence factors a contributor to pathogenicity? correct answer: They
help bacteria survive in nonfavorable conditions.
9. 3) Select the best answer.
What is the purpose of a probiotic? correct answer: to keep bacterial colonies stable
and balanced
10. 4) Select the best answer.
How are gut flora beneficial to the body? correct answer: NOT "They help the pancreas
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3
