It has been difficult to generate drugs to treat AIDS for which reason?
a. HIV does not cause AIDS.
b. HIV does not use any enzymes that can be targeted by drugs.
c. HIV mutates rapidly.
d. The only way to kill a virus is with a vaccine, not with drugs.
e. People with HIV infections die rapidly, before the drugs have a chance to cure them.
Answer: c. HIV mutates rapidly.
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A skeleton that relies on muscular force exerted against water is termed
A. a hydrostatic skeleton. B. an endoskeleton. C. an exoskeleton. D. an ectoskeleton. E. a hygroscopic skeleton.
When young male white-crowned sparrows first begin to sing, they match their vocal output to ____
a. any birdsong they hear during their initial days of singing b. an instinctive blueprint of their species' song c. the memory of their species' song heard months earlier d. the memory of whatever song they heard during an early critical period e. the songs of male relatives heard during their initial days of singing
The water strider shown in the figure above is able to stand on water because of the ____ of water
a. covalent bonds b. surface tension c. van der Waals forces d. density e. hydration layer
Condensation reactions typically produce
a. monomers. b. salts. c. polymers. d. simple sugars. e. amino acids.