Which of the following is not a reason why gene regulation in prokaryotes is simpler than in eukaryotes?
A. Prokaryotic DNA is not packaged in
chromosomes.
B. Prokaryotic DNA is not sequestered in the
nucleus.
C. Processing of mRNA does not occur in
prokaryotes.
D. Prokaryotic mRNA travels rapidly from the
nucleus.
E. Transcription and translation are not
separate processes in prokaryotes.
C
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Taxis is defined as
A. the learning of a behavior that is associated with consequences of the behavior. B. a movement towards or away from a stimulus. C. a motor response initiated by a stimulus, continuing to completion of the response. D. an instantaneous, automatic response to a stimulus. E. rapid learning of behaviors by an animal during a restricted time in the animal's life.
Microfilaments are made of ________
A) tubulin B) actin C) intermediate proteins D) phospholipids
The molecular fragment on an antigen molecule that a lymphocyte recognizes and responds to is called a/an
A. variable region. B. antigen binding site. C. epitope. D. hapten.
Which of the following can be used to isolate pure cultures of bacteria from mixtures?
A. Streak plates B. Pour plates C. Spread plates D. All of the choices are correct.