Embryonic stem cells cannot develop into __________ cells
a. muscle
b. nerve
c. blood
d. placental
e. other stem
D
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The olfactory receptors discovered by Richard Axel and Linda Buck are members of a large family of similar receptor molecules termed
A. G-protein coupled receptors. B. ligand-gated ion channels. C. voltage-gated ion channels. D. intracellular receptors. E. serine/threonine proteases.
The sternum is a major site of red blood cell formation; therefore, the bones in the sternum must be ____ bones
a. compact b. spongy c. cartilaginous d. fibrous e. synovial
Which of the following is not likely to be found in large quantities in an energy drink?
A. niacin B. fats C. folic acid D. caffeine E. amino acids
Which of the following statements concerning cryptochrome is FALSE?
a. It is implicated in resetting the biological clock. b. It is a "clock protein." c. It absorbs green light. d. Its counterparts are found in fruit flies and mice. e. It sometimes interacts with phytochrome.