Which of the following sequences correctly represents the phytochrome signal transduction pathway?
a. red light ? PIF3 activation ? PIF3 into nucleus ? light-responsive gene switched off
b. red light ? Pfr to Pr ? Pr into nucleus ? Pr-PIF3 complex ? light-responsive gene
regulation
c. UV light ? PIF3 into nucleus ? light responsive gene produces phytochrome ? Pr to Pfr
d. blue light ? Pfr into nucleus ? Pfr-PIF3 complex ? light-responsive gene regulation
e. red light ? Pr to Pfr ? Pfr into nucleus ? Pfr-PIF3 complex ? light-responsive gene
regulation
E
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Peristalsis is:
A. waves of muscular contractions that move food through the digestive system. B. a band of muscle that opens to allow small amounts of digested food to enter the small intestine. C. the mechanical breakdown of food in the stomach. D. the chemical breakdown of proteins. E. the formation of an ulcer in the stomach.
Eukaryotic transcription factors:a
are known as CAPs. b. may be activators or repressors of transcription. c. are inducers. d. are corepressors. e. are also known as enhancers.
The intentional injection of an attenuated virus into a person will lead to
A. Artificially acquired passive immunity B. Naturally acquired passive immunity C. Naturally acquired active immunity D. Eventual disease E. Artificially acquired active immunity
There is a tiny muscle attached to the malleus, but if the muscle contracts, the sound will not be efficiently passed to the next structure, which is called the ________
A) incus B) tympanum C) oval window D) stapes