DNA Replication

What is DNA?

★It is the stuff that makes you

yourself! It is your instructions.

★It is written in a code that needs

to be read and interpreted.

★It has the structure of a

double helix.

★The word DNA stands for

DeoxyriboNucleic Acid.

What is in DNA?

★

It is made of nucleotides
which contain:
○A chemical compound
called a phosphate
group

○a nitrogenous base,
either:
■Adenine (A)

■Thymine (T)

■Guanine (G)

■Cytosine (C)

○a 5 carbon sugar
(called deoxyribose).

Review:

CHO- Carbohydrate

CHO- Lipids

CHON- Proteins

CHONP- Nucleic Acids

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What makes up DNA’s
special code?

★The nucleotides (adenine,
thymine, guanine, and cytosine)
make up the code. It is their
order/sequence that is important.

★They combine together to write
their code in a specific way.

○A matches with T;

○C matches with G

○To remember think: Car
goes in Garage and Apple
goes with Tree

How is DNA made?

★ DNA is made during the

S phase of the cell cycle.

○

As review: the cell
cycle contains 4
phases:

G1, S, G2, M

★ It is made in a process

called DNA replication

★

During DNA
Replication:

a. The DNA is unwound

by a special enzyme

b. Another enzyme then

creates a
template/primer to
help build a new DNA
strand

c. Next, a third enzyme

then creates the DNA
to match that
template/primer

d. Finally, a fourth

enzyme then glues the
whole thing back
together.