Which of the following is produced by the light reactions of photosynthesis and consumed by the Calvin cycle?
A. water
B. O2
C. NADPH
D. sugar
C. NADPH
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How do eukaryotic transcription factors exert their effects on transcription when their binding sites can be thousands of base pairs away from the promoter?
A. Regulatory proteins bind the sequences and then slide along the DNA until they reach an RNA polymerase bound to a promoter. B. After binding to the site, the regulatory protein releases the DNA and is targeted to the polymerase via coactivator proteins. C. Once bound to the site, the regulatory protein catalyzes the formation of an effector molecule that then travels to and binds the polymerase. D. The DNA between the bound site and the polymerase-promoter complex loops out, increasing proximity.
Which one of the following methods of antimicrobial susceptibility testing is the most popular method in the United States? (Note: information about susceptibility testing can be found on the CD-ROM that accompanies this book.)
A) agar dilution method B) disk-diffusion method C) macro broth dilution method D) micro broth dilution method
If you were given the task of choosing a biological control agent for a reed from eastern China that has become invasive in the southeastern U.S., what do you think would be the best choice? Consider both the effectiveness and the safety of the agent you be releasing.
A. A generalist beetle, native to the U.S., that can consume massive quantities of the reed in a few weeks. B. A nematode, native to eastern China, that specializes on the reed but can take up to two years to kill a plant. C. A caterpillar, native to the U.S., that normally eats close relatives of the weed, but has been found in lab trials to perform better on the Chinese reed. D. A fungal pathogen from eastern China that specializes on the reed and can kill a plant in a few months.
The synthesis of RNA on a DNA template
What will be an ideal response?