Chapter 15: Q. 16 (page 392)
The RNA components of ribosomes are synthesized in the ________. a. cytoplasm b. nucleus c. nucleolus d. endoplasmic reticulum
Option c is correct.
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If mRNA is complementary to the DNA template strand and the DNA template strand is complementary to the DNA nontemplate strand, then why are base sequences of mRNA and the DNA nontemplate strand not identical? Could they ever be?
A scientist observes that a cell has an RNA polymerase deficiency that prevents it from making proteins. Describe three additional observations that would together support the conclusion that a defect in RNA polymerase I activity, and not problems with the other polymerases, causes the defect.
The -10 and -35 regions of prokaryotic promoters are called consensus sequences because ________.
a. they are identical in all bacterial species b. they are similar in all bacterial species
c. they exist in all organisms
d. they have the same function in all organisms
Figure 15.11 A scientist splices a eukaryotic promoter in front of a bacterial gene and inserts the gene in a bacterial chromosome. Would you expect the bacteria to transcribe the gene?
A scientist introduces a mutation that makes the 60S ribosomal subunit nonfunctional in a human cell line. What would be the predicted effect on translation?
a. Translation stalls after the initiation AUG codon is identified.
b. The ribosome cannot catalyze the formation of peptide bonds between the tRNAs in the A and P sites.
c. The ribosome cannot interact with mRNAs.
d. tRNAs cannot exit the E site of the ribosome.
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