DNA Flashcards
1
Q
structure of DNA
A
- composed of individual nucleotides
- double-stranded helix
- compacted into nucleus by packaging around histone proteins then supercoiling itself
- hydrogen on 2’
2
Q
nucleotide components
A
- phosphate group
- deoxyribose group
- nucleobase (A,G,T,C)
3
Q
1’ carbon
A
attached to the nucleobase
4
Q
5’ carbon
A
attached to the phosphate group
5
Q
pyrimidines
A
- one ring structure
- thymine + cystosine
6
Q
purines
A
- two ring structure
- guanine + adenine
7
Q
nucleotide pairings
A
- pair together because of space between sugar-phosphate backbones → one ring structure pairs with two ring structure
- A + T = two hydrogen bonds
- G + C = three hydrogen bonds
8
Q
phosphodiester bonds
A
- form ling chains of single stranded DNA
- from 3’ of sugar to P of phosphate group
- condensation reaction → water is lost
