This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: organism) 2. The molecule must copy itself (replicate) precisely. 3. Changes in genes (mutations) sometimes occur; the molecular structure should ”allow for” or help to explain such changes. Aspects of DNA structure known prior to Watson and Crick’s work: 1. The DNA molecule is very large 2. It is composed of nucleotides 3. The molecule’s structure is “orderly”; possibly a helix 4. Within a DNA molecule, A=T, and G=C. Discovery of the double helix laid the foundation to the study of molecular biology. Base pairs make up the steps of the helix (the rungs of the ladder) The code is read in base triplets. Three letters at a time. GTA codes for one amino acid. Smallest DNA molecules contain 5000 base pairs. Some have 3Million base pairs. 200billion in a lilly....
View Full Document
- Spring '08
- DNA, Crick, ribonucleic acid, nucleic acids DNA, Nitrogenous base DNA