Rank the Following One-Base Point Mutations with Respect to Their
Rank the following one-base point mutations with respect to their likelihood of affecting the structure of the corresponding polypeptide (from most likely to least likely).
1) insertion mutation deep within an intron
2) substitution mutation at the third position of a codon in an exon
3) substitution mutation at the second position of a codon in an exon
4) deletion mutation within the first exon of the gene
A) 1, 2, 3, 4
B) 4, 3, 2, 1
C) 2, 1, 4, 3
D) 3, 1, 4, 2
In eukaryotic cells, transcription cannot begin until
A) the two DNA strands have completely separated and exposed the promoter.
B) several transcription factors have bound to the promoter.
C) the 5 caps are removed from the mRNA.
D) the DNA introns are removed from the template.
Which of the following is not true of a codon?
A) It may code for the same amino acid as another codon.
B) It never codes for more than one amino acid.
C) It extends from one end of a tRNA molecule.
D) It is the basic unit of the genetic code.
The anticodon of a particular tRNA molecule is
A) complementary to the corresponding mRNA codon.
B) complementary to the corresponding triplet in rRNA.
C) the part of tRNA that bonds to a specific amino acid.
D) catalytic, making the tRNA a ribozyme.