A molecule comprised of a five-carbon sugar, a nitrogen-containing base, and a phosphate group is called:
a. a nucleic acid.
b. a triglyceride.
c. deoxyribonucleic acid.
d. a polypeptide.
e. a carbohydrate.
C
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Which pair of organisms would have the most homologous ?-globin genes?
A. dolphin and bumble bee B. catfish and crocodile C. snake and mouse D. frog and cheetah E. human and chimpanzee
Why doesn't the stomach acid just digest right through the wall of the stomach?
A. The lining of the stomach is protected by mucus. B. Food prevents the acid from digesting the wall of the stomach. C. The pH of the stomach acid is not low enough to be able to digest the lining. D. Neutralizers are imbedded in the stomach lining. E. It does, we just rebuild the layers faster than they can be digested.
The structure labeled "7" is the
a. food vacuole. b. gullet. c. macronucleus. d. micronucleus. e. mitochondrion.
The tuberculin response is mediated by
A) memory T cells. B) mast cells. C) B lymphocytes. D) plasma cells. E) eosinophils.