Which one of the following processes in sewage treatment requires bacterial metabolism?
A) chlorination
B) primary treatment
C) removal of BOD
D) sedimentation
E) None of the answers is correct.
C
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The reverse transcription of HIV RNA utilizes host cell tRNA as a primer. Specifically, a tRNA for lysine is utilized. Would a drug that blocked the host cell synthesis of the tRNA for lysine be a good drug to prevent the HIV life cycle?
A. Yes, it should stop the reverse transcription of the HIV genome with few side effects. B. No, the virus would just use a different tRNA for priming. C. No, this would likely kill the cells that were drug treated, because they couldn't appropriately incorporate lysine into their proteins D. No, the priming function of the tRNA is not essential for the HIV life cycle.
Chlorophyll a is the most common photosynthetic pigment in plants. It's abundance gives plants their green color. This is because it:
a. absorbs light of low wavelengths (400-500 nm) b. reflects green light c. absorbs yellow and blue light d. absorbs green light e. is a translucent pigment which does not influence the color of the plant
One consequence of the lack of introns in bacterial genes is that
A) exons are eliminated during transcription. B) a 5' cap and poly (A) tail can be added immediately. C) bacterial proteins are very short and not subject to mutation. D) translation can begins before transcription is complete because prokaryotes do not have a nucleus. E) integrated viral DNA is not recognized for transcription.
Feedback inhibition is an example of:
a. translational control. b. transcriptional control. c. posttranslational control. d. a repressible system. e. constitutive control