Figure on p. 737
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Use the figure above showing the process of gastrulation to answer the following question.
The letter "A" in the accompanying figure represents ____.
A. ectoderm
B. endoderm
C. mesoderm
D. neural plate
E. yolk
Answer: D
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A scientist studying a material has determined that 12C, 13C, and 14C occur in the material in a ratio of 1000:10:1. How did he most likely differentiate between these forms of carbon?
A. by the number of protons in 12C, 13C, and 14C B. by the number of electrons in 12C, 13C, and 14C C. by the number of neutrons in 12C, 13C, and 14C D. by the biomasses of 12C, 13C, and 14C E. by the number of positrons in 12C, 13C, and 14C
How do C4 plants minimize photorespiration?
A. Stomata are only opened at night, storing oxygen in malate. During the day, the oxygen is released for photosynthesis. B. The light reactions and the Calvin cycle occur in different cells, so carbon dioxide does not come into contact with rubisco. C. Stomata are only opened at night, storing carbon dioxide in the stromata. During the day, the carbon dioxide is released for photosynthesis. D. The light reactions and the Calvin cycle occur in different cells, so oxygen does not come into contact with rubisco. E. Stomata are only opened at night, storing carbon dioxide in malate. During the day, the carbon dioxide is released for photosynthesis.
Which of the following is NOT true of enzyme behavior?
a. Enzyme shape may change during catalysis. b. Enzymes cannot make something happen that would not happen on its own. c. All enzymes have an active site where substrates are temporarily bound. d. Each enzyme can catalyze a wide variety of different reactions. e. Enzymes speed up reactions.
The surface tension of the alveolus is reduced by surfactants produced by what type of cells?
A) ciliated B) goblet C) type I alveolar D) type II alveolar E) type III alveolar