Which of the following occurs when the cAMP-CAP complex binds the CAP site near the lac promoter?
A. Transcription rate decreases.
B. Transcription rate increases.
C. RNA polymerase binds to the promoter.
D. RNA polymerase binds to the promoter and transcription rate decreases.
E. RNA polymerase binds to the promoter and transcription rate increases.
E. RNA polymerase binds to the promoter and transcription rate increases.
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The most widely accepted and supported model that explains the movement of phloem sap in flowering plants is the
____ mechanism.
a. cohesion-tension b. translocation c. pressure flow
d. osmosis e. transpiration
What type of response is most associated with the brain sensing a cold environment? a. Decrease in blood flow to the skin
b. Heart rate decreasing. c. Increased respiration. d. Sweat glands increase their output. e. Increase in blood flow to the skin.
Experiments in nematode worms show feeding worms 10-30% less food:
a) made worms angry b) increased lifespan c) drastically changed susceptibility to temperature change d) decreased lifespan
Farmers often include legumes as part of their normal crop rotation. This practice increases the overall production of their crops by
A) suppressing the growth of weeds. B) adding phosphorus to the soil. C) helping the soil retain water. D) adding nitrogen to the soil. E) making the soil less acidic.