The circulatory system below would be representative of a circulatory system found in a ____
a. frog
b. pig
c. bird
d. grasshopper
e. pig and a bird
ANSWER: a
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All the following antimicrobial agents work by inhibiting cell wall synthesis except:
A) cephalosporins. B) chloramphenicol. C) penicillin. D) vancomycin.
The complement system
a. includes a group of about 30 plasma proteins. b. induces a cascade of proteins that counteract invasion by coating the invading cells. c. attracts phagocytic leukocytes to attack invading cells. d. causes the lysis of the plasma membranes of invading cells. e. does all of these.
After a copper smelter begins operation, local downwind populations of plants begin to adapt to the resulting air pollution. Scientists document, for example, that the acid tolerance of several plant species has increased significantly in the polluted
area. This is an example of A) stabilizing selection. B) disruptive selection. C) directional selection. D) genetic drift.
What type of chemical bond joins the bases of complementary DNA strands?
A) ionic B) covalent C) hydrogen