chemical components of DNA
DNA is a nucleic acid made up of nucleotides joined into long strands or chains by covalent bonds
nucleotides that make up DNA
each nucleotide contains a deoxyribose molecule, a phosphate group, and a nitrogen-containing base
How are the nucleotides in a strand of DNA joined?
covalent bonds formed between the sugar of one nucleotide and the phosphate group of the next
UV light and nitrogenous bases
the bases have a chemical structure that is exceptionally good at absorbing UV light (why we get tan)
Order & sequence of nucleotides
sequence of a strand does not matter but A always matches up with T and G always matches up with C
scientists responsible for discovering the structure of DNA
Erwin Chargaff, Rosalind Franklin, James Watson, and Francis Crick
What did Franklin's x-rays discover?
x-shape pattern hinted that the strand in DNA are in the double-helix shape
What did Watson and Crick discover?
worked on figuring out the structure of DNA, built 3D models, saw Franklins x-rays, breakthrough model of the double-helix in DNA
What does the double-helix model tell us about DNA?
explains Chargaff's rule of base pairing and how two strands of DNA are held together