Which of the following ligands would not have an intracellular receptor?
A) cortisol
B) retinoic acid
C) thyroxine
D) epinephrine
E) progesterone
D) epinephrine
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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.
Cows are able to survive on a diet consisting almost entirely of cellulose because
A. cows are autotrophic. B. the cow, like the rabbit, ingests its feces. C. cows can manufacture all 20 amino acids out of sugars in the liver. D. unlike humans, the saliva the cow produces has enzymes capable of digesting cellulose. E. cows have cellulose-digesting, symbiotic microorganisms in their rumens.
One of the following is a growth factor
A. Water B. Co2 C. mineral D. Vitamin E. ATP
An experimental test of the hypothesis to explain the origin of the first organic compounds on Earth might include all of the following sequential steps except
A. inoculating with a few bacteria to get the process started. B. providing energy with electrical spark discharges. C. placing this atmosphere over liquid water. D. assembling an atmosphere with H2, CH4, NH3, and H2S. E. increasing the temperature of the gases.