Chapter 15: Q. 17 (page 392)
In any given species, there are at least how many types of aminoacyl tRNA synthetases? a. 20 b. 40 c. 100 d. 200
Option a is correct.
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The RNA components of ribosomes are synthesized in the ________. a. cytoplasm b. nucleus c. nucleolus d. endoplasmic reticulum
Figure 15.13 Errors in splicing are implicated in cancers and other human diseases. What kinds of mutations might lead to splicing errors? Think of different possible outcomes if splicing errors occur.
Imagine if there were 200 commonly occurring amino acids instead of 20. Given what you know about the genetic code, what would be the shortest possible codon length? Explain.
The AUC and AUA codons in mRNA both specify isoleucine. What feature of the genetic code explains this?
a. complementarity
b. nonsense codons
c. universality
d. degeneracy
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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