A nonphotosynthetic plant sharing a mycorrhizal fungus with a photosynthetic plant is best described as a(n)
A. symbiont.
B. host.
C. mutualist.
D. parasite.
E. epiparasite.
Answer: E
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The rate of exchange of carbon between the atmosphere and the oceans represents a carbon:
A. sink. B. reservoir. C. biomass. D. precipitation. E. flux.
In dissimilatory sulfate reduction by Desulfovibrio, electrons are passed out of the cell, where they are used to reduce sulfide completely to sulfate.
Answer the following statement true (T) or false (F)
Most body heat in endotherms is derived from _____ while most body heat in ectotherms is derived from ______.
A. metabolic processes, metabolic processes B. metabolic processes, their environment C. their environment, metabolic processes D. their environment, their environment E. fur, insulating scales
One interesting and surprising finding regarding the regulation of the ara operon is that it is under both positive and negative control. What protein is responsible for the dual action of this operon?
A) AraC is responsible for both the positive and negative control of the ara operon. B) RNA polymerasse is responsible for both the positive and negative control of the ara operon. C) AraD is responsible for both the positive and negative control of the ara operon. D) DNA polymerase is responsible for both the positive and negative control of the ara operon. E) AraBAD is responsible for both the positive and negative control of the ara operon.