When an organism dies, its muscles remain in a contracted state termed rigor mortis for a brief period of time. Contributing most directly to this phenomenon is

A. the lack of calcium to bind to troponin.
B. the absence of an oxygen supply to muscle.
C. the inability to synthesize actin and myosin.
D. the lack of ATP to break cross-bridges between thick and thin filaments.


Answer: D

Biology & Microbiology

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Food for the continental shelf benthic community primarily comes in the form of

a. migratory fish. b. living kelps. c. detritus. d. plankton. e. nutrients from terrestrial runoff.

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In Figure 43-3, the vestibular canal is labeled:a

1
b. 2
c. 3
d. 7
e. 8

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Which lineage includes lizards and snakes?

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