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.

Biology & Microbiology

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An evolutionary tree depicts species' relationships based on descent from shared ancestors.

a. true b. false

Biology & Microbiology

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.

Biology & Microbiology

  Figure 22.18 ? Refer to the above figure for questions.   ? Which numbered item in the above figure represents a female gametophyte?

A. 1 B. 2 C. 3 D. 4 E. 5

Biology & Microbiology

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

Biology & Microbiology