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IBDP Biology HL topic 2.7
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It Covers topic 2.7 in the IBDP higher level Biology course.
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topic 2.7By A- rathi AnandÉ.¥Éa←É•.
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DNA Replication
Transcription
and Translation
, staple 2 .
7
Essential Idea :
Genetic Information in DNA can be accurately copied
and translated to make proteins needed by the cell .
Understanding : the replication of DNA is semi conservative and -
depends on complementary base pairing .
DNA replication is a semi conservative process, because when-
a new
double stranded DNA molecule is formed ;
-
|•0nestmndwillbefnmtheoriginaItempIaHmoIewT)
-
•
one strand will be
synthesized newly
multiple ribosomes reading single mRNA ⇒ Pay some
Semi-Conservative DNA Molecule
This occurs because each only pair with
nitrogenous base can
its complementary pair .
→ Adenine EA) pairs with Thymine G)
→
cytosine (c) with Guanine (G)
pain
Consequently when DNA is replicated by the combined action
OF helicase and DNA
polymerase :
to
Each new strand formed will be identical to the original
strand separated from the template .
•
The two semi -
conservative molecules formed will have an
identical base sequence to the original molecule .
skill :
Analysis of Meseton and Stahl 's results to obtain support for the
theory of semi conservative replication of DNA
-
The theory that DNA replication was semi -
conservative was confirmed by the
mes el son Stahl experiment in 1958 -
.
Prior to this experiment, three hypotheses had been proposed for the metho
of replication .
-
/
conservative Model An entirely new molecule is synthesized from a DNA
(
• • -
template ( which remains unaltered)
FIJIanointed Imagine hedonism or newly
Imm
•
one
•
Dispersive Model -
New molecules are made of segments of new
and Old DNA . ✓
-
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