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8.3 DNA Replication Topic: DNA replication Objective: DNA replication is when DNA is copied. nucleotide The DNA molecule unzips in both directions.

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8.3 DNA Replication Replication copies the genetic information. A single strand of DNA serves as a template for a new strand. General Description: DNA is replicated during the S (synthesis) stage during Interphase of the cell cycle..IS COPIED

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8.3 DNA Replication LETS IDENTIFY THE STRUCTURES ON THE RIGHT FIRST 1.PHOSPHATE AND SUGAR BACKBONE 2.BASES 3.FREE FLOATING BASES WITH ENZYME 4.NEW STRAND OF DNA

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8.3 DNA Replication Proteins carry out the process of replication. Process: 1. Enzyme is called HELICASE unzips the double helix 2. Free-floating bases pair with the exposed bases that have been unzipped nucleotide The DNA molecule unzips in both directions. nucleotide The DNA molecule unzips in both directions.

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8.3 DNA Replication 3. Another enzyme, DNA polymerase, bond the nucleotides together to form the double helix DNA polymerase new strand nucleotide

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8.3 DNA Replication original strand new strand Two molecules of DNA 4. END RESULT: Two new molecules of DNA are formed Original is blue, new is orange.

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8.3 DNA Replication DNA REPLICATION EXAMPLE: DS DNA DNA UNZIPPED REPLICATED DNA A-TA- -T A-T A-T T-AT--AT-AT-A C-GC--GC-GC-G G-CG--CG-CG-C A-TA--TA-T A-T ORIGINAL STRAND HELICASE UNZIPS, NEED NEW BASESDNA POLYMERASE BONDS NEW NUCLEOTIDES TOGETHER T A C T G A T G C C