A molecule that is a first messenger but not a second messenger is:
a. cyclic AMP.
b. G protein.
c. adenylyl cyclase.
d. protein kinase.
e. acetylcholine.
E
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Riftia tube worms contain unusual hemoglobins that bind(s)
A) H2S and O2 in order to transport these chemicals to their bacterial symbionts. B) high concentrations of O2 produced by their photosynthetic symbionts. C) sulfate to transport this ion away from their bacterial symbionts. D) ammonia that their bacterial symbionts produce.
Distinguish between the central and peripheral nervous systems
What will be an ideal response?
__________ are dormant structures formed by bacteria in response to adverse environmental
conditions. a. Capsids b. Endospores c. Exotoxins d. Endotoxins e. Heterocysts
In the light-independent reactions of photosynthesis, CO2 is added to a five-carbon molecule known as
A. cellulose. B. deoxyribose. C. CAM. D. ribose. E. RuBP.