DNA+replication

DNA Replication (Q 9-12) read page 191(end of section 11.2 ).
 * __DNA Replication __**

(9) What is DNA replication? Write a good definition of this. DNA replication is the process in every organism that clones the DNA and its genetic information (code)

"Before a cell divides, its DNA is replicated (duplicated.) Because the two strands of a DNA molecule have complementary base pairs (the bases of each side match up like a zipper), the nucleotide sequence of each strand automatically supplies the information needed to produce its partner. If the two strands of a DNA molecule are separated, each can be used as a pattern or template to produce a complementary strand A and T are complementary, and C anf G are complementary). Each template and its new complement together then form a new DNA double helix, identical to the original. Before replication can occur, the length of the DNA double helix about to be copied must be unwound. In addition, the two strands must be separated, much like the two sides of a zipper, by breaking the weak hydrogen bonds that link the paired bases. Once the DNA strands have been unwound, they must be held apart to expose the bases so that new nucleotide partners can hydrogen-bond to them. The enzyme DNA polymerase then moves along the exposed DNA strand, joining newly arrived nucleotides into a new DNA strand that is complementary to the template. Each cell contains a family of more than thirty enzymes to insure the accurate replication of DNA."

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(10) Complete the following:


 * __Step 1__**: The two strands (sides) of the DNA split apart.

Each strand acts as a template.


 * __Step2__**: Proteins match up against each strand.

We end up with two new strands.

(11) Copy the diagram in the middle of page 191, showing how DNA replicates (Section 11.2 ).

(12) Find a good YouTube Video on DNA Replication and embed it here.

DNA Replication animation

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