8.3 DNA Replication TEKS 3E, 5A, 9C The student is expected to: 3E evaluate models according to their limitations in representing biological objects or.

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8.3 DNA Replication TEKS 3E, 5A, 9C The student is expected to: 3E evaluate models according to their limitations in representing biological objects or events; 5A describe the stages of the cell cycle, including deoxyribonucleic acid (DNA) replication and mitosis, and the importance of the cell cycle to the growth of organisms; 9C identify and investigate the role of enzymes

8.3 DNA Replication TEKS 3E, 5A, 9C KEY CONCEPT DNA replication copies the genetic information of a cell.

8.3 DNA Replication TEKS 3E, 5A, 9C Replication copies the genetic information. A single strand of DNA serves as a template for a new strand. The rules of base pairing direct replication. DNA is replicated during the S (synthesis) stage of the cell cycle. Each body cell gets a complete set of identical DNA.

8.3 DNA Replication TEKS 3E, 5A, 9C Proteins carry out the process of replication. DNA serves only as a template. Enzymes and other proteins do the actual work of replication. –Enzymes unzip the double helix. –Free-floating nucleotides form hydrogen bonds with the template strand. nucleotide The DNA molecule unzips in both directions.

8.3 DNA Replication TEKS 3E, 5A, 9C –Polymerase enzymes form covalent bonds between nucleotides in the new strand. –DNA polymerase enzymes bond the nucleotides together to form the double helix. DNA polymerase new strand nucleotide

8.3 DNA Replication TEKS 3E, 5A, 9C DNA replication is semiconservative. original strand new strand Two molecules of DNA Two new molecules of DNA are formed, each with an original strand and a newly formed strand.

8.3 DNA Replication TEKS 3E, 5A, 9C There are many origins of replication in eukaryotic chromosomes. DNA replication starts at many points in eukaryotic chromosomes. Replication is fast and accurate. DNA polymerases can find and correct errors.