How might drugs that interfere with the
functioning of the apicoplast in the malariacausing
protist probably not be harmful to
humans?
a. the drugs would kill the protist before it
infected a human
b. the drug would prevent the protist from
photosynthesizing which is its energy
source
c. humans never evolved photosynthetic
organelles and thus would be unaffected by
a drug targeting that type of organelle
d. humans already have resistance to
apicoplast drugs
e. any drug that would prevent the functioning
of apicoplasts would not work in a human
system
C
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It is believed that the coelacanths and lungfish represent a crucial link between other fishes and tetrapods. What is the major feature in these fish in support of this hypothesis?
A) Like amphibians, they are tied to the water for reproduction. B) Their fins have skeletal and muscular structures similar to amphibian limbs. C) They have highly evolved nervous and circulatory systems. D) They have lungs and are able to breathe air when water is scarce. E) They enter a hibernative stage when food is scarce, as many tetrapods do.
In breast tumors the presence of multiple copies of the HER2 gene is correlated with a more aggressive cancer
Which of the following methods would allow comparison of different cancer cells to determine which have more copies of the HER-2 gene? A. PCR with primers that contain restriction sites B. RT-PCR C. quantitative PCR D. PCR with conventional primers E. All of these choices are correct.
Facilitated diffusion is specific, which indicates that ____
a. a specific protein will transport certain polar or charged molecules but not others b. only one specific integral protein per membrane is involved in this process c. the energy molecule ATP is specifically required for transport d. only specific hydrophobic molecules can be transported
e. transport of molecules occurs only in specific cellsOcean currents ____ in the Northern Hemisphere and ____ in the Southern Hemisphere
a. circulate counterclockwise; circulate clockwise b. move west to east; move east to west c. move east to west; move west to east d. circulate clockwise; circulate counterclockwise e. undulate along a line northeast and southwest; undulate along a line southeast to northwest