Which of the following areas of the human body is(are) not normally free of microorganisms?

A. Intestinal tract
B. Eyes
C. Respiratory tract
D. All of the choices are correct.


Answer: D

Biology & Microbiology

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The presence of cyanobacteria ____ in rock dating to 2.5 billion years ago is direct evidence of the first water-splitting

photosynthesizers.

a. microfossils b. biosignatures c. stromatolites d. cytoskeletons e. endosymbiont

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Resource partitioning is the result of

a. parasitism. b. mutualism. c. competition. d. predation. e. commensalism

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A powerful way to demonstrate that observed differences between a treatment group and a control group truly reflects the effect of the treatment is for researchers to:

A) get their study published in a scientific journal. B) use a variety of statistical tests until they find one that shows statistical significance. C) conduct the experiment over and over again. D) make more observations. E) formulate as many hypotheses as possible

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How many pyruvic acid molecules are generated during the oxidation of one glucose molecule during cellular respiration?

A) one B) two C) zero D) three E) four

Biology & Microbiology