This organism can infect deeper wound sites and produce exotoxins, enzymes and gas that cause tissue and muscle necrosis:
A. Clostridium botulinum
B. Clostridium perfringens
C. Clostridium difficile
D. Clostridium tetani
E. All of the choices are correct.
Ans: B. Clostridium perfringens
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The fluid mosaic model proposed by Singer and Nicolson in 1972 explained that
A. the cell membrane was composed of lipids and proteins. B. the cell membrane was composed of a phospholipid bilayer between two layers of globular proteins. C. the cell membrane was composed of a phospholipid bilayer with globular proteins actually inserted into the bilayer. D. the cell membrane was composed of a phospholipid bilayer but the polar ends of the phospholipid molecules were reversed.
The number of circuits in the circulatory systems of humans is
(a) one. (b) two. (c) three. (d) four.
Why don't plant cells use a contractile ring to divide their daughter cells?
A. Plant cells don't have an actin cytoskeleton. B. Plant cells don't form daughter cells. C. A contractile ring can't "pinch" a cell wall. D. Plant cells don't have plasma membranes.
Which of the following best describes sponges?
A) They are asymmetrical, lack tissues, and do not move. B) They are symmetrical, lack tissues, and do not move. C) They are asymmetrical, have tissues, and do not move. D) They are symmetrical, have tissues, and do not move.