Even though a hydra only has a nerve net, not a central nervous system, it still has

A. synapses.
B. gray matter.
C. white matter.
D. an autonomic nervous system.
E. the same neurotransmitters as humans.



A. synapses.

Biology & Microbiology

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A plant’s response to the relative lengths of light and dark periods in its environment during each 24-hour period is a

phenomenon called ____.

a. gravitropism b. photoperiodism c. thigmotropism d. circadian rhythms e. phototropism

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Membrane-like structures form when proteins or lipids are mixed with water. They serve as a model for __________,

which may have preceded cells. Fill in the blank(s) with the appropriate word(s).

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A complex, interrelated network of organisms and the surrounding nonliving environment in a defined area is a(n)

A) ecosystem. B) population. C) biosphere. D) community. E) biome.

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Which of the following statements about bacteriocins is FALSE?

A) The genes coding for them are on plasmids. B) They cause food-poisoning symptoms. C) Nisin is a bacteriocin used as a food preservative. D) They can be used to identify certain bacteria. E) Bacteriocins kill bacteria.

Biology & Microbiology