Which of the following statements regarding extinction is (are) correct?
I) Only a small percentage of species is immune from extinction.
II) Extinction occurs whether humans interfere or not.
III) Extinctions can even be caused indirectly by humans.
A) only I
B) only II
C) only III
D) only II and III
E) I, II, and III
Answer: D
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Which of the following statements regarding xylem vessels in angiosperm trees is not true?
A. Vessels allow angiosperms to have higher rates of water flow through stems. B. Angiosperms are able to fix more CO2 and have higher growth rates due to vessels. C. Vessels are rigid and strong and do not require additional support cells. D. Angiosperm wood structure has a high degree of diversity due to the presence of several distinct cell types. E. Angiosperms primarily use vessels to transport water and minerals.
Lignin degradation by basidiomycetes is an aerobic process that is catalyzed by phenoloxidases.
Answer the following statement true (T) or false (F)
Which of the following cell types are specifically responsible for the B cell response?
A) T cells
B) B cells
C) phagocytic cells
D) natural killer cells
The primary function of the light reactions of photosynthesis is to
A) use ATP to make glucose. B) convert light energy to the chemical energy of lipids. C) produce energy-rich ATP and NADPH. D) produce energy-rich glucose from carbon dioxide and water. E) produce NADPH used in respiration.