Many flower traits are specifically attractive to a certain type of pollinator. For example, the scent of rotting flesh is attractive to certain flies and beetles but not to most other pollinators. What adaptive purpose is served by this kind of "niche
marketing" of flowers to specific pollinators?
A) This adaptation works to reduce pollinator traffic at a flower. Therefore, flowers do not have to produce as much nectar to feed big crowds of pollinators.
B) This adaptation reduces pollinator traffic so that flowers have a chance to develop their pollen fully before it is spread.
C) This targeting is done because the wrong kind of pollinator might eat all the pollen instead of delivering it to another flower.
D) This adaptation helps to assure that pollen will be delivered to another flower of the same species. If less specialized pollinators are used, the odds are greater that pollen will wind up on the stigma of a different species.
Answer: D
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Which one of the following statements about G-protein coupled receptor-mediated stimulation of adenylate cyclase is notcorrect?
A. Adenylate cyclase is stimulated by GTP-bound G-protein. B. The cAMP generated by adenylate cyclase binds directly to a transcriptional activator. C. The cAMP generated by adenylate cyclase is a second messenger. D. The stimulation of adenylate cyclase is transduced through protein phosphorylation.
Which of the following could be electron acceptors in anaerobic respiration?
A. nitrate or oxygen B. sulfate or oxygen C. lactic acid D. nitrate or sulfate E. All of the answer choices are correct.
The most primitive group of animals, lacking tissues and organs, are the:
a. sponges. b. corals. c. flatworms. d. gastropods. e. sea anemones
Which of the following would NOT be true of cDNA produced using horse liver tissue as a starting material?
A. It is a copy of an mRNA expressed in horse liver cells. B. It is produced from mRNA using reverse transcriptase. C. It could be used to create a library of genes expressed in horse liver. D. It can be sequenced using the dideoxy chain-termination method. E. It contains genes from horse liver cells with both exons and introns.