Which of the following is not true of the regulation of the arabinose operon?
A. CRP activates expression when bound to cAMP.
B. AraC protein recruits RNA polymerase when bound to arabinose.
C. Arabinose binds to AraC protein, decreasing its affinity for a DNA site near the promoter.
D. Arabinose binding alters the conformation of the dimerization domain of the AraC protein.
C
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Many species might coexist in a particular environment by occupying different ecological
A. biomes. B. niches. C. territories. D. domains. E. ranges.
How must spindle microtubules attach to chromosomes during prometaphase of meiosis I?
a. Microtubules attach at the centrosomes. b. Microtubules attach to the chiasma. c. Spindle microtubules from one pole attach to one kinetochore, and spindle microtubules from the other pole attach to the other kinetochore in a pair of sister chromatids, just like in mitosis. d. Spindle microtubules from one pole must attach to both kinetochores in a pair of sister chromatids. e. Microtubules attach using their minus (slow assembling) ends.
Maturation of B cells occurs in the
A. lymph nodes. B. bone marrow. C. Peyer's patches. D. thymus. E. spleen.
People identified as "universal donors" have (A/B/AB/O) blood type.
Fill in the blank(s) with the appropriate word(s).