All algae ____
a. are unicellular
b. are multicellular
c. have chlorophyll
d. are motile at all stages of their life cycle
e. have life cycles with alternating generations
ANSWER: c
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Which step in the evolution of life is the most complex and probably occurred last?
a. formation of DNA b. formation of protein-RNA systems c. formation of membrane-bound proto-cells d. spontaneous formation of organic compounds under abiotic conditions e. formation of ATP
What percentage of heart cells are part of the cardiac conduction system?
a. 1 percent b. 10 percent c. 20 percent d. 25 percent e. 100 percent
Which of the following is a type of cytokine?
a. complement protein b. mast cell c. immunoglobulin d. lysozyme e. tumor necrosis factor
Trichomonas vaginalis is usually transmitted during sexual intercourse because it
A) requires a growth factor found only in the vagina. B) penetrates cells lining the genitourinary tract. C) participates with HIV in coinfections. D) produces cysts that germinate in the vagina. E) cannot live long outside the body.