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.
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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
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).
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.
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.