The synthesis of sugar molecules through the process of photosynthesis requires energy absorbed from sunlight. Bearing this in mind, what kind of reaction is photosynthesis?
A. endergonic
B. catabolic
C. exergonic
D. feedback
Answer: A
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In designing a new drug that may interfere with G-protein coupled receptor interacting protein functions, one possible target for drug action is not
A) altering ligand affinity for the receptor. B) promoting close association with other signal proteins. C) modifying epinephrine production. D) promoting receptor dimerization. E) controlling receptor localization in the membrane.
Four of the five answers listed below are correctly paired. Select the exception
a. A-C b. C-G c. A-T d. T-A e. purine-pyrimidine
Clues from geology and paleontology suggest that simple cells, or their precursors, arose about _____ years ago.
A. 6 million B. 4 billion C. 2 billion D. 1 million E. 3 million
Which combination makes the most sense from an evolutionary perspective?
a. light skin and vitamin D deficiency b. light skin and extensive exposure to sun c. dark skin and little exposure to sun d. dark skin and folate deficiency e. light skin and little sun, or dark skin and lots of sun