BIOS 242 WEEK 2 QUIZ
Question 1
pts
( TCO 4) Explain how temperature and pH levels can influence microbial infections in the
human body.
Your Answer:
In the body there are areas that have different pH levels and different temperatures. Microbial
infections require the perfect environment to grow. So if the microbe you are trying to grow
likes low temperature and a low pH it would not grow well in the stomach or the vagina. The
temperature and the pH can be the cause of life or death of a microbe. In the stomach a
common infection is H.pylori because it like the acidic environment.
Chapter 6: Microbial Growth and Nutrition
All microbes have particular ranges of temperature and pH within which they exist. When the
temperature or pH of their environment falls outside this range, their growth is inhibited, and
they may even die as a result of the adverse conditions. Therefore, only those microbes whose
pH and temperature requirements match those conditions found in the human body will be
able to grow and reproduce there. For example, because the temperature of the human body is
37° C, only mesophiles can reproduce there. In addition, the pH of most tissues and fluids in the
body is 6.5–7.5, which matches the pH requirements of neutrophiles. Therefore, it is not
surprising that most human pathogens are mesophiles and neutrophiles. But this is not always
the case. Some microbes have adapted to environments that would otherwise be extremely
hostile to most microbes. A good example is the bacterium Helicobacter pylori, which is able to
live in the extremely acidic conditions of the stomach by secreting substances that help to
neutralize the acid. The result is an infection that can lead to stomach ulcers.
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Question1b
pts
( TCO 3) Which of the following is a magnifying lens?
Objective
Ocular
, Condenser
Dark-field stop
Correct!
Both the objective and the ocular
Chapter 4: Microscopy, Staining, and Classification
Question 2
pts
(TCO 3) The microscope preferred for viewing living specimens is the _____ microscope.
You Answered
bright-field
Correct Answer
phase-contrast
scanning electron
scanning tunneling
transmission electron
Chapter 4: Microscopy, Staining, and Classification
Question 3
pts
Question 1
pts
( TCO 4) Explain how temperature and pH levels can influence microbial infections in the
human body.
Your Answer:
In the body there are areas that have different pH levels and different temperatures. Microbial
infections require the perfect environment to grow. So if the microbe you are trying to grow
likes low temperature and a low pH it would not grow well in the stomach or the vagina. The
temperature and the pH can be the cause of life or death of a microbe. In the stomach a
common infection is H.pylori because it like the acidic environment.
Chapter 6: Microbial Growth and Nutrition
All microbes have particular ranges of temperature and pH within which they exist. When the
temperature or pH of their environment falls outside this range, their growth is inhibited, and
they may even die as a result of the adverse conditions. Therefore, only those microbes whose
pH and temperature requirements match those conditions found in the human body will be
able to grow and reproduce there. For example, because the temperature of the human body is
37° C, only mesophiles can reproduce there. In addition, the pH of most tissues and fluids in the
body is 6.5–7.5, which matches the pH requirements of neutrophiles. Therefore, it is not
surprising that most human pathogens are mesophiles and neutrophiles. But this is not always
the case. Some microbes have adapted to environments that would otherwise be extremely
hostile to most microbes. A good example is the bacterium Helicobacter pylori, which is able to
live in the extremely acidic conditions of the stomach by secreting substances that help to
neutralize the acid. The result is an infection that can lead to stomach ulcers.
Powered by TC PDF ( www.tc pdf.org)
Question1b
pts
( TCO 3) Which of the following is a magnifying lens?
Objective
Ocular
, Condenser
Dark-field stop
Correct!
Both the objective and the ocular
Chapter 4: Microscopy, Staining, and Classification
Question 2
pts
(TCO 3) The microscope preferred for viewing living specimens is the _____ microscope.
You Answered
bright-field
Correct Answer
phase-contrast
scanning electron
scanning tunneling
transmission electron
Chapter 4: Microscopy, Staining, and Classification
Question 3
pts
