1. The first three nucleotides of a six nucleotide palindromic restriction site
ID: 173850 • Letter: 1
Question
1. The first three nucleotides of a six nucleotide palindromic restriction site are GTC; what are the next three? (Note: only bases in one DNA strand are shown)
A. GCT
B. GTC
C. CAG
D. GAC
2. A bacterial cell has been exposed to a powerful mutagen. A sequence from one DNA strand in this cell is compared to the same sequence from its ancestral cell. Intervening sequences where the ancestral and descendant cells have identical sequences are represented by dots.
Ancestral cell
..CTT...CAG...CAA...CGG...GTT..
Descendant (mutated) cell
..CCT...CGG...CTA...CAG...GAT..
In the mutated cell, there have been _______ transversions and ______ transitions.
A. 1;4
B. 0;4
C. 3;1
D. 2;3
3. What is the name of the type of mutation that results in a change of an amino acid encoding codon to a stop codon?
A. nonsense mutation
B. reversion
C. missense mutation
D. stop mutation
1. The first three nucleotides of a six nucleotide palindromic restriction site are GTC; what are the next three? (Note: only bases in one DNA strand are shown)
A. GCT
B. GTC
C. CAG
D. GAC
2. A bacterial cell has been exposed to a powerful mutagen. A sequence from one DNA strand in this cell is compared to the same sequence from its ancestral cell. Intervening sequences where the ancestral and descendant cells have identical sequences are represented by dots.
Ancestral cell
..CTT...CAG...CAA...CGG...GTT..
Descendant (mutated) cell
..CCT...CGG...CTA...CAG...GAT..
Explanation / Answer
1. D. GAC
Explanation: A palindomic sequence can be read same in th 5' to 3' direction in both the strands.
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