Which of the following samples of microbial communities would be best suited for study by microelectrode experiments?
A. Striated microbial mats
B. Ten gallons of seawater
C. During infection in a human patient
D. Sample sorted by optical tweezers
Answer: A
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What cytoskeletal protein is important to the function of the sperm cells illustrated in Figure 11.13?
A. microfilaments B. intermediate filaments C. microtubules D. All of the above are correct.
Which of the following is the primary site of nutrient absorption in the mammalian digestive system?
A. pharynx B. stomach C. small intestine D. large intestine E. pancreas
Bacteria are most essential in the cycling of:
a. carbon. b. water. c. phosphorus. d. nitrogen. e. energy.
Frameshift mutations can do all of the following except
A) insert or eliminate an amino acid. B) insert or delete a DNA base. C) render the protein useless to the cell. D) substitute one amino acid for another. E) change the protein's amino acid sequence.