A student prepares lysate A from cells with high levels of cAMP and lysate B from cells with very low levels of cAMP. If these lysates were subjected to DNase, it could be predicted that cAMP receptor protein binding sites would be:
A. not present in either lysate.
B. protected in lysate A.
C. protected in lysate B.
D. equally protected in both lysates.
E. not occupied in either lysate.
B
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The balance between osteoblast and osteoclast activities is an example of homeostasis and is regulated by the action of two hormones.
a. true b. false
deoxyribonucleic acid (DNA)
What will be an ideal response?
Which of the following has/have developed antibiotic resistance?
A. gonorrhea B. enterococci C. malaria D. tuberculosis E. All of these diseases and organisms have developed drug resistance.
Picea glauca is a seed-bearing plant. What other characteristic MUST be true of this species?
A. Double-fertilization results in the production of endosperm. B. It produces flowers. C. It produces fruits. D. The gametophyte is the dominant generation. E. It has vascular tissue.