Refer to the accompanying figure. What structure is designated by label B?
a. activation gate
b. inactivation gate
c. modulatory sensor
d. transport pump
e. transport sensor
b
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When species are kept separate by preventing the formation of hybrid zygotes, the mechanism that keeps the species separate is known as a _____________ isolating mechanism.
A. hybridization B. postzygotic C. prezygotic D. adaptive E. differential
The glandular secretions involved in digestion that would most likely be released as inactive precursors are
A. protein-digesting enzymes B. fat-solubilizing bile salts C. acid-neutralizing bicarbonate D. carbohydrate-digesting enzymes
At which level(s) is eukaryotic gene expression regulated?
a. transcription b. translation c. posttranscription d. posttranslation e. all of these
Several distribution patterns are seen in natural populations; the most common is ________
a. clumped b. uniform c. random d. none of the choices