A mutation in the human gene for a fibroblast growth factor receptor (FGFR) appears to be responsible
for ____.
a. Duchenne muscular dystrophy
b. phenylketonuria
c. achondroplasia
d. sickle-cell anemia
e. cystic fibrosis
C
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Why are chemotherapeutic agents effective against cancer cells and yet less effective at killing normal cells?
A. These agents are actually toxic to normal cells that are not actively dividing. B. These agents are toxic to cancer cells because they are actively dividing to form a tumor, whereas normal cells are not dividing or are dividing slowly. C. Many cancer drugs destroy telomeres, making the cancer cell mortal. D. These agents are toxic to cancer cells that are not actively dividing. E. None of the explanations given is true.
Which is NOT TRUE about chemoautotrophs?
a. They were the first cells on earth. b. They thrived on oxygen. c. They used methane as a carbon source. d. Many became extinct with the arrival of photoautotrophs. e. They did not use solar energy to feed themselves.
Which photosynthetic unit consists of a pair of chlorophyll a molecules with an absorption peak of 700nm?
a. photolysis b. Calvin cycle c. photosystem I d. antenna complex e. photosystem II
Subacute bacterial endocarditis is commonly the result of infections initially focused on the oral cavity.
Indicate whether the statement is true or false.