Four of the Five choices listed below produce alterations in the sequence of DNA nucleotides. Select the exception.
a. helicase
b. point mutations
c. insertion
d. deletion
e. base substitution
2007-04-23 02:58:58 · 3 answers · asked by Gee 1 in Science & Mathematics ➔ Biology
A.
B - a point mutation is a change in a DNA nucleotide, but only one. This change changes the sequence.
C - Insertion means something's been put in between two previously-neighbored DNA nucleotides.
D - Deletion means a nucleotide has been removed.
E - Base substitution is one method by which point mutations occur.
2007-04-23 03:04:08 · answer #1 · answered by Brian L 7 · 0⤊ 0⤋
a. helicase
this enzyme unwinds the DNA strands
2007-04-23 10:06:59 · answer #2 · answered by Orinoco 7 · 0⤊ 0⤋
a
2007-04-23 11:45:11 · answer #3 · answered by tictactoe 2 · 0⤊ 0⤋