Ecotypes are variants within a species that are adapted to local environmental conditions
Indicate whether the statement is true or false
TRUE
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If an operon is regulated by ____ control, genes are ____ by a regulatory protein called a ____
a. positive; on unless they are switched off; repressor b. negative; off unless they are switched on; repressor c. negative; on unless they are switched off; repressor d. positive; off unless they are switched on; repressor e. positive; on unless they are switched off; activator
Areas of the spinal cord appear glistening white
because of a. naked dendrites. b. cell bodies. c. axon endings. d. lack of meninges. e. myelin sheaths of axons.
The loudness (intensity) of a sound is specifically associated with the
A) frequency of sound waves. B) area of the brain interpreting the sensory input. C) specific hair cells that respond in the cochlea. D) amplitude of the sound waves. E) duration of the sound.
The time from when pathogen first enters the body and begins to multiply, until symptoms first appear is the
A. incubation period. B. convalescent stage. C. prodromal stage. D. period of invasion. E. All of these choices are correct.