Which of the following would occur if there were a mutation in the lacO site (lac Operator) of the lac operon?
A. Binding of RNA polymerase could be hindered.
B. Binding of a repressor protein could be hindered.
C. Binding of the activator protein could be hindered.
D. Duplication could be affected.
E. The order in which the genes of the lac operon are transcribed could be altered.
B. Binding of a repressor protein could be hindered.
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The period in which modern continents were separated from an original Pangaea supercontinent, was the
A. Permian. B. Jurassic. C. Quaternary. D. Carboniferous. E. Cretaceous.
The major pathway for molecules to pass into and out of the nucleus is through
a. gap junctions between the nuclear envelope membranes. b. porin channels in the nuclear envelope membranes. c. nuclear pore complexes. d. diffusion through the membrane bilayers of the nuclear envelope.
Why does a DNA strand grow only in the 5? to 3? direction?
A) because DNA polymerases can only add nucleotides to the 3? end of the growing molecule B) because DNA polymerases can only add nucleotides to the 5? end of the growing molecule C) because the DNA molecule only unwinds in the 5? to 3? direction D) because DNA polymerase requires the addition of a starter nucleotide at the 5? end
Streptococcus mutans is a major cause of cavities. It resides in the gum pockets, does not have catalase activity, and can be grown outside of an anaerobic chamber. The bacterium is probably which of the following?
A. a facultative anaerobe B. an obligate aerobe C. an obligate anaerobe D. an aerotolerant anaerobe