If you were setting up an experiment to disprove spontaneous generation in a liquid medium, which of the following would be essential to the experiment?
A) supplying the liquid with nutrients
B) starting with a liquid that contains microorganisms
C) adding antibiotics to the liquid
D) using a sterile liquid and eliminating exposure to microorganisms
E) adding carbon dioxide to the liquid
D
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The Cystoisospora belli organism, which contains two sporocysts with four sporozoites each, is recovered from fecal specimens and has also been implicated in traveler's diarrhea. The drug of choice to treat infection caused by C. belli is:
a. trimethoprim-sulfamethoxazole combina-tion. b. tetracycline. c. albendazole. d. flagyl.
As a seed germinates, its shoot points upward toward light, and its roots grow downward into the soil. Turn the plant sideways, and the stem and roots bend according to the new direction of gravity. How do roots and shoots grow in opposite directions as the plant is rotated?
A. The absorption of light by phytochromes only occurs in shoots. B. The roots and shoots respond oppositely to auxin. C. The circadian rhythms of roots and shoots are opposite. D. Statoliths move in the opposite direction of roots and shoots. E. through differences in thigmotropism
Which of the following hormones increases when plants are flooded?
A. cytokinin B. auxin C. ethylene D. gibberellin E. abscisic acid
14. One of the most critical pieces of evidence to the discovery of DNA structure was
A. its composition of four different nucleotides. B. its mode of replication. C. an X-ray diffraction pattern suggesting a double helix shape. D. the backbone containing sugar-phosphate linkages. E. the covalent bonding between different nucleotides.