Most of the energy within an ecosystem is lost:
a. when organisms disperse
b. when organisms die
c. as a result of metabolism
d. by organisms at the top of the food web
e. by decomposers
c
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Many species of ants "farm" aphids, protecting them from predation and collecting concentrated sugars (i.e. honeydew) from them. This type of ant/aphid relationship is known as
A. dispersive mutualism. B. defensive mutualism. C. parasitism. D. trophic mutualism. E. commensalism.
You have type A blood (genotype IAi). Who can you donate blood to in an emergency?
a. type O only b. type AB only c. type A only d. types A and B, not O e. types A and AB
On Monday morning, after you’ve already finished reading your email and begun assembling apparatus for your next series of tests, one of your colleagues arrives late, looking decidedly unwell. After exchanging the usual pleasantries, you find out the reason: There were two oranges in the fridge on Friday before it was your turn to clean it out. The other orange had fewer black mold spots than the one you triple-bagged while holding your breath…and your colleague really loves oranges. What was she suffering from over the weekend?
a. opportunistic mycosis b. mycetismus c. mycotoxicosis d. superficial mycosis
When a repressor binds to the operator site on the DNA it normally ________.
A. has no effect on transcription B. terminates transcription that has already been initiated C. inhibits the initiation of transcription D. reduces the rate of transcription