The Irish potato famine in the 1840s was caused in large part by a proliferation of a(n)
A. chlorophyte.
B. paramecia.
C. oomycote.
D. dinoflagellate.
E. fungus.
Answer: C
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A doctor discovers that her patient can produce antibodies against some bacterial pathogens, but he is unable to protect himself against viral infections. The doctor suspects a disorder in her patient's
A. B cells. B. plasma cells. C. cytotoxic T cells. D. suppressor T cells. E. macrophages.
Which of the following is the proper sequence for mitosis?
I. metaphase II. telophase III. prophase IV. anaphase
a. II, I, IV, III b. I, II, III, IV c. III, I, IV, II d. IV, III, II, I e. I, IV, II, III
The most important receptors for steady touch are
a. Pacinian corpuscles. b. Meissner's corpuscles. c. Merkel's discs. d. Ruffini endings. e. free nerve ending.
The movement of water molecules during osmosis is due to
A. diffusion. B. active transport. C. pinocytosis. D. endocytosis.