TTTTTTTTTTTTTTAAAAAAAAGGGGGGGGGGGGCCCCCCCCCCDNA Replicationnucleusnew DNA strandsoriginal DNA strands(template)DNA (chromatin) replicatedenzymeCopying DNABefore mitosis begins, the cell copies its genetic material using a process called DNA replication. The amount of DNA doubles. A special enzyme unzips the double stranded DNA and each strand becomes a template on which a new strand is formed.Complementary bases pair-up with the exposed bases on the template strand.CGATnucleotidenitrogen basesugarphosphatephosphatenitrogen basesugarnucleotideDNA StructureDouble-stranded DNA (deoxyribonucleic acid) has a twisted ladder-like shape called a double helix. Each DNA strand is composed of a series of nucleotides. A nucleotide contains a sugar, phosphate, and nitrogen base ­ adenine (A), guanine(G), cytosine(C), or thymine(T). DNA double helixThe nitrogen bases pair with each other, adenine with thymine and cytosine with guanine. These are called complementary base pairs. MitosisCellGrowthDNAReplicationCytokinesisPreparationfor MitosisInterphaseThe Cell Cycle© Copyright NewPath Learning. All Rights Reserved. 94-4737Visit www.newpathlearning.com for Online Learning Resources.
< Page 8 | Page 10 >