In Figure 8.4, the antibiotic chloramphenicol binds the 50S ribosome as shown. From this information you can conclude that chloramphenicol
A) prevents transcription in eukaryotes.
B) prevents translation in eukaryotes.
C) prevents transcription in prokaryotes.
D) prevents translation in prokaryotes.
E) prevents mRNA-ribosome binding.
Ans: D) prevents translation in prokaryotes.
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All of the following are reverse transcriptase inhibitors used to treat HIV infection EXCEPT
A. didanosine. B. azidothymidine. C. lamivudine. D. acyclovir. E. zalcitabine.
Nematodes
A. have a pseudocoelom. B. are bilaterally symmetrical. C. have a mouth and an anus. D. All of the above are correct.
We would expect that a 15-nucleotide sequence that includes a stop codon at the end (as part of the 15-nucleotide sequence) will direct the production of a polypeptide that consists of
A) two amino acids. B) three amino acids. C) four amino acids. D) five amino acids.
Sickle-cell disease causes hemoglobin proteins to become altered. What direct effect does this have on red blood cells?
A. Red blood cells swell up, allowing fewer to flow through tiny capillaries and reducing blood flow. B. Red blood cells become sickle-shaped, clumping up and blocking blood flow in capillaries. C. Red blood cells shrivel up, causing too many of them to flow through capillaries at once, increasing blood pressure. D. Red blood cells become sickle-shaped, resulting in them carrying increased oxygen to body cells. Hyperoxia results.