Electrons from photosystem I are transferred down an electron transport chain to ________, which become reduced to ________
A) NADPH; NADP+ B) NAD+; NADPH C) ADP; ATP D) NADP+; NADPH
Answer: D
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Most of the significant changes in activities and functions that accompany passage through a cell cycle checkpoint are regulated by the:
A. activation of microtubules. B. changes in membrane polarization. C. activation of kinase enzymes. D. activation of DNA polymerase. E. inhibition of cyclin proteins.
After contracting SARS, about ____ percent of the infected died
a. 10 b. 25 c. 50 d. 75 e. 100
The utricle and saccule are functional parts of
the a. eye. b. Pacinian corpuscle. c. vestibular apparatus. d. nasal epithelium. e. vomeronasal organ
Early Greek philosophers were among the first to:
a. develop a philosophy of a natural world driven by physical laws. b. describe the heavenly bodies as gods or personages. c. explain the world around them according to fixed laws of nature. d. A and C.