Among the effects of vitamin A deficiency are
a. dry skin, eyes, and mucous membranes.
b. increased vulnerability to infections of the skin,
eyes, and mucous membranes.
c. impaired growth and development.
d. mental impairment.
e. all of these.
Answer: e
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Cells that are produced during meiosis have _____ of chromosomes and are referred to as ____.
a. one set; diploid b. two sets; diploid c. one set; haploid d. two sets; haploid
The fusion of the cytoplasms of two genetically different cells is ____
a. osmosis b. karyogamy c. cytoplasmic streaming d. plasmogamy e. symbiosis
Which of the following traits is unique to arthropods?
a. Appendages b. Segmentation c. A ventral nerve cord d. A dorsal anterior brain e. An exoskeleton
What is a sink population?
a. a large pan-mictic population comprising all members of a species b. a metapopulation c. a local population that would decline to extinction without immigration d. a local population in which emigration rate exceeds immigration rate e. A and B