The Structure of Deoxyribonucleic Acid DNA The Structure of Deoxyribonucleic Acid

Cell division and DNA replication Cells divide Growth, Repair, Replacement Before cells divide they have to double cell structures, organelles, and their genetic information

How does DNA make more DNA? DNA replication How does DNA make more DNA?

DNA Structure - Discovery Structure was discovered in 1953 by James Watson and Francis Crick

DNA DNA = Deoxyribose nucleic acid Made out of sugars (deoxyribose), phosphates and nitrogen bases

Rungs formed by nucleotide bases DNA structure “Backbone” formed by sugar-phosphate Rungs formed by nucleotide bases

Bases always bond with the same partner: purine - pyramidine Adenine – Thymine Guanine - Cytosine

Each DNA strand serves as a template for the assembly of a new strand DNA replication Each DNA strand serves as a template for the assembly of a new strand

2 daughter DNA molecules DNA replication: Summary Result: 2 daughter DNA molecules Each containing 1 parent strand and 1 new strand Identical to each other Identical to parent DNA