Transportation-produced smog causes air to turn
a. gray.
b. black.
c. brown.
d. red.
e. blue.
C
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Which of the following is not a function of the midgut?
A. storage of ingested food B. chemical digestion of macromolecules by enzymes C. nutrient absorption D. nutrient absorption and chemical digestion of macromolecules E. All of these answer options are functions of the midgut.
The primary goal of antimicrobial susceptibility testing is to:
a. Determine whether the pathogen expresses resistance to the potential therapeutic antimicrobial agents. b. Determine the spectrum of an organism's intrinsic resistance. c. Determine whether the administered anti-biotic is effective at killing the pathogen in vivo. d. Identify toxins secreted by bacterial pa-thogens isolated from a clinical specimen.
Which of the following does not contribute to prokaryotic genetic variability?
a. mutation b. binary fission c. gene transfer by conjugation d. gene transfer by transduction e. gene transfer by transformation
Why is photorespiration more of a problem for a plant when their stomata are closed?
A. Oxygen, from water in photosystem I, cannot leave the leaf, and competes with carbon dioxide for rubisco's active site. B. Oxygen, from photosystem I, cannot leave the leaf and causes hypertension to occur in the leaves. C. Carbon dioxide levels increase from the light reactions, and compete with oxygen for rubisco's active site. D. Oxygen cannot enter the leaf, blocking normal respiration, so the plants switch to photorespiration. E. Water is lost when the stomata are open, and is not available to accept electrons from photosystem I.