Penicillin is an antibiotic that inhibits enzymes from catalyzing the synthesis of peptidoglycan, so which prokaryotes should be most vulnerable to inhibition by penicillin?
a) gram-positive bacteria
b) archaea
c) mycoplasmas
d) gram-negative bacteria
e) endospore-bearing bacteria
Answer: a) gram-positive bacteria
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Methane is an important greenhouse gas whose levels in the atmosphere are also rising. This is because:
A. methane is generated by archaeons living in the guts of cattle, and beef production is increasing. B. methane is generated by archaeons living in waterlogged rice paddies, and rice production is increasing. C. methane is released when permafrost at high latitudes melts, and more permafrost is melting. D. methane is generated by archaeons living in the guts of cattle and in rice paddies, and both beef and rice production are increasing. E. All of the above.
P53 is a ____
a. transcription factor that turns on expression of cell division inhibiting proteins b. protein encoded by an oncogene c. protein that promotes entry into the cell cycle when DNA is undamaged d. hormone used to treat cancer e. growth promoting factor
It is difficult to make an HIV vaccine because the ____
a. virus mutates rapidly b. cost is prohibitive c. virus uses DNA d. virus is a retrovirus e. components of the virus is found in high concentrations in the blood
Tropical rain forests are restricted primarily to the ________ zone between latitudes 10° N and 10° S
Fill in the blank(s) with correct word