The reducing agent during the Calvin cycle is:
A. NADPH.
B. ATP.
C. oxygen.
D. NADH.
E. FADH2.
A
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Protein kinase is an enzyme that _____
A) functions as a second messenger molecule B) serves as a receptor for various signal molecules C) activates or inactivates other proteins by adding a phosphate group to them D) produces second messenger molecules
The hydrogen ion gradient across the thylakoid membrane is required to ________________
What will be an ideal response?
Birds that pursue their prey underwater are:
a. gulls. b. pelicans. c. penguins. d. stilts. e. plovers.
While looking for evidence of early human or humanlike individuals, you discover a cave in which
there are paintings, engravings, and sculptures. Which of the following most likely lived in the cave at some time during their life? a. Australopithecus africanus b. Neandertals c. Homo erectus d. Cro-Magnons e. Homo habilis