A production/respiration ratio of one indicates:
a. the reef is productive and exporting nutrients.
b. little biomass is available for export.
c. the reef may begin to decline.
d. community respiration is too high.
e. algae are overgrowing the coral.
B
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How do eukaryotic cells build and maintain genetic diversity?
A. through horizontal gene transfer B. through asexual reproduction C. by allowing more mutations D. through sexual reproduction
Which of the following statements is NOT true of Gram-positive bacteria?
A. They have a thicker peptidoglycan layer than do Gram-negative bacteria. B. They turn purple when subjected to the Gram-staining process whereas Gram-negative bacteria stain pink. C. They lack the lipopolysaccharides that Gram-negative bacteria have. D. They are less resistant to antibiotics than Gram-negative bacteria. E. They have a gram molecular weight of more than 1.0 whereas Gram-negative bacteria have a gram molecular weight of less than 1.0.
Which statement is false with regard to adult cell cloning?
a. It involves differentiated cells.
b. It occurs with some frequency in nature. c. It involves rewinding the developmental clock. d. It involves an egg cell that has had its nucleus removed. e. It may involve nuclear transfer.
One trend in the evolution of animals is the increase in the number of tissue (germ) layers during embryonic development. Flatworms and more complex animals have ________ layers
A) two B) three C) four D) five E) six