Dental plaque (a biofilm), a first stage in tooth decay, consists of
A. sugars.
B. bacteria surrounded by a polysaccharide matrix.
C. fluoride.
D. lactic acid.
E. bacteria and high pH.
B. bacteria surrounded by a polysaccharide matrix.
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An evolutionary tree depicts species' relationships based on descent from shared ancestors.
a. true b. false
Each of the following is a voltage-gated Na+ channel property except
A) opens rapidly when stimulated. B) closes rapidly in absence of stimulus. C) opens to a variable extent depending on how much the stimulus voltage exceeds the threshold voltage. D) has a voltage sensor helix that controls channel gating. E) can be inactivated by the inactivating particle part of the channel protein.
Figure 22.18
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Refer to the above figure for questions.
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Which numbered item in the above figure represents a female gametophyte?
A. 1 B. 2 C. 3 D. 4 E. 5
To which group of fishes does the following description apply: swim bladder, bony skeleton, and paired fins supported by bony rays.
A. Sarcopterygii B. Acanthodii C. Placodermi D. Chondrichthyes E. Actinopterygii