In muscle function at the sarcomere level, the formation of cross-bridges is regulated by the binding of ___ ions to ____.
A. calcium, troponin
B. calcium, tropomyosin
C. calcium, myosin
D. sodium, troponin
E. sodium, tropomyosin
A. calcium, troponin
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What is the main purpose of light-dependent reactions of photosynthesis?
A) to generate oxygen by "splitting" H2O B) to produce NADPH for use in respiration C) to produce NADPH and ATP D) to use ATP to make glucose
The work of James B. Sumner was to
A) discover ribozymes. B) prove that enzymes were carbohydrates. C) isolate the insulin hormone. D) originate the term ferments to describe enzymes. E) crystallize urease, the first enzyme isolated.
Which trait is characteristic of a K-selected species?
a. adapted to rapidly changing environments b. small body size c. short generation time d. provide substantial parental care to offspring e. single reproductive event
While studying eukaryotic mRNA processing, you encounter the sequence GUACACACAUGAG in the middle of a long mRNA transcript. Which statement can you make, based on your discovery?
a. This sequence will be replaced by a poly-A tail. b. This transcript will be assembled into a ribosome. c. This transcript has not yet undergone splicing. d. This is a transcript for Asparagine tRNA.