The discharge of high levels of microbial nutrients into marine environments has
A. had negative impacts on shellfish and other bottom-dwelling marine animals.
B. resulted in the production of large hypoxic or anoxic regions.
C. resulted in algal blooms and red tides that have killed marine mammals.
D. All of the choices are correct.
Answer: D
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The genome of Pelagibacter ubique ________.
A. is the smallest one thus far sequenced for a non-parasitic bacterium B. has a very limited number of nucleotides between coding regions C. contains no pseudogenes D. All of the choices are correct.
Which of the following is not true of viruses?
A. Viruses replicate by binary fission. B. Viruses are acellular. C. Viruses consist of one or more molecules of DNA or RNA enclosed in a coat of protein and sometimes in other more complex layers. D. Viruses can exist in two phases: intracellular and extracellular.
Which of the following does not have a true coelom?
A. snail B. earthworm C. insect D. sea star E. roundworm
Fish can exhibit behaviors that are directed to
a. members of the same species. b. members of different species. c. nonliving constituents of the environment. d. all of these choices.