Changes in behavior that result from environmental experiences are called:a
instincts.
b. learned behaviors.
c. proximate causes.
d. ultimate causes.
e. innate behaviors
b
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Testosterone is produced and secreted by
a) spermatogonia b) sustentacular cells c) seminiferous tubules d) interstitial cells
Which of the following best describes an ocean as an open system?
a. It does not exchange matter with its surroundings. b. It absorbs but not releases energy. c. It absorbs and releases energy. d. It exchanges energy but not matter with its surroundings.
In most cases protein kinases
a. polymerize amino acids b. hydrolyze proteins c. stimulate adenylyl cyclase d. bind cGMP e. add phosphate groups to proteins
Which of the following applications of recombinant DNA technology is NOT controversial?
a. genetic screening b. biological weapons development c. metagenomics d. genetic food modification