Once a hormone activates the enzyme adenylyl cyclase, ATP is converted to cAMP, which in turn:a
activates protein kinase.
b. inhibits phosphodiesterase.
c. initiates more cAMP production.
d. initiates protein synthesis.
e. inhibits protein synthesis.
a
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You isolate a plant that expresses a phytochrome mutant that is always in the
Pfr form. You expect these plants will germinate A. not at all. B. regardless of the light conditions. C. later than normal plants. D. similarly to normal plants.
A new virus is discovered that causes cells to lyse. Which of the following types of assay would be useful for diagnosing infection with this virus?
A) agglutination B) complement fixation test C) viral hemagglutination D) both agglutination and complement fixation tests E) viral neutralization
You are studying the affects of transcription factors on the activation of gene expression. However, when first starting your study, you notice that some of the transcription factors bind further away from the DNA that it is aiming to transcribe. What description best explains this?
A. The transcription factor transcribes small RNAs that then bind to the promoter and activate the gene's expression. B. The assistance of RNA looping moves the transcription factor closer to the promoter. C. DNA looping transports the transcription factor closer to the promoter and initiates gene transcription. D. Signals originate via inducers from the transcription factor to the site of promotion that activate transcription of the gene.
Which of the following groups of drugs can become incorporated into the bones and teeth of a fetus?
A. beta-lactams B. aminoglycosides C. quinolones D. tetracyclines E. sulfonamides