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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

At which level(s) is eukaryotic gene expression regulated?

a. transcription b. translation c. posttranscription d. posttranslation e. all of these

Biology & Microbiology

Several distribution patterns are seen in natural populations; the most common is ________

a. clumped b. uniform c. random d. none of the choices

Biology & Microbiology