Protein Synthesis Page 3
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2
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4SICM Tuition
Biology AS
A
T
A
T
G
C
base pairs
G
C
T
A
T
A
sugar phosphate backbone
A
T
A
T
C
G
C
G
The enzyme DNA helicase breaks the
hydrogen bonds between the cases causing
One original molecule of DNA
the strands to separate (to unzip) from one
end.
A
T
A
T
T
G
C
A
G
C
C
T
A
T
G
A
A
T
A
C
T
G
G
C
C
G
G
C
T
G
C
Complementary bases join with hydrogen
A
bonds and free nucleotides link up to for a
new strand
The exposed bases attract the
complementary bases of free DNA
nucleotides. (e.g. C will only attract G)
A
T
A
T
original (old) DNA strand
G
C
G
C
T
A
T
A
new strand
A
T
A
T
Two exact copies of the
The sequence of the bases is
original DNA molecule have
kept exactly the same due to
C
G
C
G
been made
specific base pairing
Page 7
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