| A | B |
|---|
| Erwin Chargaff | American biochemist who discovered an important clue to the structure of DNA |
| amount of adenine ='s amount of ________ | thymine |
| amount of thymine ='s amount of __________ | adenine |
| amount of cytosine ='s amount of __________ | guanine |
| amount of guanine ='s amount of __________ | cytosine |
| Chargraff's rules | the amounts of different compounds match with one other of the compouds (on other flashcards) |
| x-ray crystallography | process of photographing DNA where x-rays pass through a crystal substance and onto photographic film |
| Crick and Watson | solved mystery of DNA structure |
| structure of DNA | long strands of nucleotides (backbone of te structure), with a base attached to each sugar, perp. to the backbone |
| components of a nucleotide | one phospate next to another, making backbone of sugars and phosphates (bases are attached to sugars) |
| purines | bases (adenine and guanine) that have two loops or rings in their structures (bigger than pyrimidines) |
| pyrimidines | two bases (tymine and cytosine) that are smaller than purines and have only one ring/loop |
| double helic | model of DNA in which two strands are wrapperd around each other, twisted into a ladder (spiral shape) |
| sides of the ladder | sugar phosphate backbones |
| rungs of the ladder | bases facgin inward toward center, next to each other in paris held by weak electron attractions of hydrogen |
| replication | the process by which DNA makes copies of itself |
