Numerous Xenopus cells were exposed to varying amounts of ultraviolet light. Some of the resulting cells were observed to lack nucleoli. As a result, one would expect that the cell could not
A) perform cellular respiration.
B) replicate its DNA.
C) perform photosynthesis.
D) synthesize ribosomal RNA.
E) perform cellular respiration or replicate its DNA.
Answer: D
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Each of the following is a primary purpose of the inflammatory response except:
A) to localize the infection. B) to neutralize any toxins being produced at the site. C) to prevent the spread of microbial invaders. D) to stimulate the production of opsonins.
The resting potential of a particular nerve cell is -66 mV. Depolarization of the membrane will shift the membrane potential toward
A) -90 mV. B) -66 mV. C) 0 mV. D) There will be no change. E) There is not enough information to tell.
Members of the ____ subphylum are mostly insects and were among the first animals to colonize terrestrial habitats
a. Myriapoda b. Trilobita
c. Chelicerata d. Hexapoda e. Crustacea
For some virulent phages, fragments of the host DNA may be included in the heads as the viral particles assemble, thus providing the basis for transduction of bacterial genes during the next cycle of infection. What is the name of this mechanism?
a. generalized transduction b. transformation c. transmutation d. specific transduction