The ability to taste PTC and other bitter chemicals is controlled by ____
a. hormone levels that change throughout life
b. the presence of fats and sugars in the food being eaten
c. the amount of PTC exposure as a child
d. the amount of capsaicin present in taste buds
e. proteins on the surface of receptor cells
e
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In the Hardy-Weinberg equation "2pq" represents
a. the homozygous recessive genotypes. b. the heterozygous genotypes. c. the homozygous dominant genotypes. d. the total pool of alleles for the dominant phenotypes. e. the heterozygous phenotypes
According to the endosymbiont hypothesis,
eukaryotic cells evolved after and as a consequence of a. the cyclic pathway of photosynthesis. b. anaerobic respiration. c. cell division. d. mutual dependency. e. chemosynthesis
In an atom with a neutral overall charge, the number of protons is equal to the ________.
A. number of electrons minus the number of neutrons B. atomic mass C. number of electrons plus the number of neutrons D. number of electrons
Which of the following methods of enumerating cells is the only one to detect live cells?
A. direct microscopic count B. viable plate count C. turbidity D. coulter counter E. flow cytometer