Bacteria cannot be classified using the biological definition of a species for which reason?

A. The DNA sequences of all bacteria are more than 97% identical.
B. Bacteria cannot reproduce.
C. Bacteria are present everywhere and cannot be reproductively isolated from other bacteria.
D. Bacteria are asexual.
E. Bacteria do not evolve.


D. Bacteria are asexual.

Biology & Microbiology

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The immunoglobulin class that is the only one capable of crossing the placenta is ________.

A. IgA B. IgG C. IgM D. IgE E. IgD

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The reason why twelve species of fruit-eating

pigeons can survive in Papua New Guinea’s tropical rain forests is related to a. mutualistic associations. b. commensalism. c. resource partitioning. d. mutualistic associations and resource partitioning e. mutualistic associations, commensalism, and resource partitioning.

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In multiple sclerosis the myelin sheaths around the axons of the brain and spinal cord are damaged and demyelination results

How does this disease manifest at the level of the action potential? I) Action potentials move in the opposite direction on the axon. II) Action potentials move more slowly along the axon. III) No action potentials are transmitted. A) only I B) only II C) only III D) only II and III

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Which of the following groups include organisms that are a key source of food in all aquatic environments and whose fossilized forms are used as a filter and as a grinding and polishing agent?

A) diatoms B) brown algae C) amoebas D) dinoflagellates

Biology & Microbiology