DNA Replication and
Transcription
HElicase unwinds the double
helix and separates the two
polynucleotide strands
DNA
REPLICATION
Helicanse breaks the
hydrogen bonds that exist
between complementary base
pairs
the separated strands will be
templates for new
complementary strands
USES dna polymerase to
synthesize new strands
occurs during the S phase of
the cell cycle
requires primer to start
replicating
occurs during the g1 and g2
phase of the cell cycle
does not need a primer
The polymerase
synthesizes from
the separated
strand
involves binding
complementary
nucleic acids to
DNA
If wrong
nucleotides are
binded there would
be errors
uses RNA polymerase
uses RNA polymerase
only some genes are copied
strand that isn't transcribed
is called sense strand which
is idewntical to the RNA
sequence with T instead of a U
strand that is transcribed is
called antisense strand and is
complementary to the rna
sequence
RNA polymerase seperates and
synthesises
when synthesizing is finished
RNA polymerase detaches the
double helix is reformed
TRANSCRIPTION