DNA

• DNA is found in the nucleus of eukaryote cells
• There are four bases of nitrogen in DNA: thymine, adenine, guanine, cytosine
• A purine always pairs with a pyrimidine, and a pyrimidine always pairs with a purine
• The purines are adenine and guanine
• The pyrimidines are thymine and cytosine
• AT 2, CG 3
• DNA has a double helix structure
• DNA is made up of many tiny monomers called nucleotides
• DNA is a polymer
• Nucleotides are made of phosphate, deoxyribose, and a nitrogenous base
• In each nucleotide the phosphate connects to the sugar and are the same
• In nucelotides the sugar connects to the base, the bases are different
• Adenine only binds with thymine, cytose only binds with guanine
• Chromosomes are long strands of DNA wrapped around proteins called histones
• Genes are segments of DNA which code for a specific protein
• Alleles are different versions of the same gene
• Each cell has 23 chromosomes