dna structure notes
Post on 16-Jul-2015
401 Views
Preview:
TRANSCRIPT
DNA - Deoxyribonucleic Acid
•Found in nucleoid of prokaryotic cells•Found in the nucleus of all eukaryotic cells
•In mitochondria (mtDNA)•In chloroplasts (ctDNA)
•Different segments along the DNA are genes• Genes - determine body function and
physical characteristics
• Genes are located on chromosomes.• Chromosomes are made of DNA & proteins
DNA - Double Helix Structure
1) Sides of the ladder are made up of sugar and phosphates
2) Nitrogen bases stick out from the sides of the ladder (rungs)
3) When the two sides (chains) of the ladder are connected, it’s a complete DNA molecule
DNA - Double Helix
4) Adenine bonds with Thymine*
5) Guanine bonds with Cytosine*
6) Hydrogen bonds connect the bases
*see next slide
Edwin Chargaff – 1947Studied DNA in various species
Nitrogen bases are proportionate within a speciesRatio of bases are various between species
•Adenine and Thymine were found in proportionate amounts•Cytosine and Guanine were found in proportionate amounts
Chargaff’s Rules
top related