DNA structure -11 Flashcards
1
Q
What does the Watson-Crick model say about the structure of DNA
A
Double stranded helical structure Sugar phosphate backbone on outside Bases on inside Stabilised by H bonds Two polynucleotide strands oriented in opposing directions
2
Q
What are the names of the base pairs
A
Cytosine (C) Thymine (T) Adenine (A) Guanine (G) (C&T are Pyrimidines and A&G are purines)
3
Q
What are polynucleotides (nucleic acid)
A
Nucleotides joined together by phosphodiester bonds
4
Q
Bonds from OH of phosphate and H of sugar form water.
A
Just kinda know it
5
Q
How is this an enzyme catalysing reaction
A
Recognises and attaches to DNA, breaks high energy phosphate bonds to release energy used to catalyse reaction.
6
Q
How must two strands of DNA be organised
A
Antiparallel
5’-3’ and 3’-5’
7
Q
How many H bonds does A-T have
A
2
8
Q
How many H bonds does C-G have
A
3
9
Q
What processes do we need DNA replication for
A
Grow through life
Pregnancy
Injury repair
mitosis and meiosis
