Chapter 15: Q. 16 (page 392)
The RNA components of ribosomes are synthesized in the ________. a. cytoplasm b. nucleus c. nucleolus d. endoplasmic reticulum
Short Answer
Option c is correct.
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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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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
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.
What transcripts will be most affected by low levels of α-amanitin? a. 18S and 28S rRNAs b. pre-mRNAs c. 5S rRNAs and tRNAs d. other small nuclear RNAs
A normal mRNA that reads 5’ – UGCCAUGGUAAUAACACAUGAGGCCUGAAC– 3’ has an insertion mutation that changes the sequence to 5’ -UGCCAUGGUUAAUAACACAUGAGGCCUGAAC– 3’. Translate the original mRNA and the mutated mRNA, and explain how insertion mutations can have dramatic effects on proteins. (Hint: Be sure to find the initiation site.)
A fragment of bacterial DNA reads: 3’ –TACCTATAATCTCAATTGATAGAAGCACTCTAC– 5’ Assuming that this fragment is the template strand, what is the sequence of mRNA that would be transcribed? (Hint: Be sure to identify the initiation site.)
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