DNA Replication

Gaiser Life Science

KnowWhy is DNA important?

Evidence

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DNA Replication

Explain your answer.

Clarifying ?s Information

Page 33

Double helix – – DNA looks like a twisted ladder or a spiral staircase.DNA looks like a twisted ladder or a spiral staircase.Structure

Bases

DNA Replication

Nitrogen bases

1. adenine1. adenine 2. thymine2. thymine 3. guanine3. guanine 4. cytosine4. cytosine

pairs Adenine only pairs with thymine.Example: (A+T = AT) or (T+A + TA)

Guanine only pairs with cytosine.

Example: (C+G = CG) or (G+C = GC)

Clarifying ?s Information

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FYI – Each new DNA molecule will be an exact duplicate of the FYI – Each new DNA molecule will be an exact duplicate of the original DNA molecule.original DNA molecule.

DNA Replication

Summary:

Example: (C+G = CG) or (G+C = GC)Replication process

Step 1 – The two sides of DNA unwind and seperateExample: like a zipper unzipping

Step 2 – Floating nitrogen bases line up.Example: TA, AT, CG, & GC

Step 3 – Bases attach to each other and 2 new DNA molecules are formed.

Example: like a zipper zipping up again

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Clarifying ?s InformationDNA Replication

Double helix – – DNA looks like a twisted ladder or a spiral staircase.DNA looks like a twisted ladder or a spiral staircase.Structure

Bases Nitrogen bases

1. adenine1. adenine 2. thymine2. thymine 3. guanine3. guanine 4. cytosine4. cytosine

pairs Adenine only pairs with thymine.Example: (A+T = AT) or (T+A + TA)

Guanine only pairs with cytosine.Example: (C+G = CG) or (G+C = GC)

FYI – Each new DNA molecule will be an exact duplicate of the FYI – Each new DNA molecule will be an exact duplicate of the original DNA molecule.original DNA molecule.

Replication process

Step 1 – The two sides of DNA unwind and seperateExample: like a zipper unzipping

Step 2 – Floating nitrogen bases line up.Example: TA, AT, CG, & GC

Step 3 – Bases attach to each other and 2 new DNA molecules are formed.

Example: like a zipper zipping up again

Summary:

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