As electrons are passed through the system of electron carriers associated with photosystem II, they lose energy. What happens to this energy?
A) It excites electrons of the reaction center of photosystem I.
B) It is lost as heat.
C) It is used to establish and maintain a proton gradient.
D) It is used to phosphorylate NAD+ to NADPH, the molecule that accepts electrons from photosystem I.
Answer: C
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Organs are composed of tissues, which are composed of cells. This is an example of which characteristic of life?
A. Living things grow and develop B. Living things respond to stimuli C. Living things maintain themselves by homeostasis. D. Living things have levels of hierarchical organization. E. Living things are adapted to the environment.
Which is the basic unit in a skeletal muscle?
A. muscle fiber B. blood vessel C. sheath D. tendon E. ligament
The ATP that is produced in the light reactions is used by the cell to
A. reproduce and grow. B. build carbohydrate molecules. C. move electrons through the electron transport chain. D. split water into H+ and O2.
The vast majority of invertebrates are:
a. parasitic. b. protostomes. c. terrestrial. d. evolutionarily primitive. e. carnivores.