DNA structure -11

Question 1

What does the Watson-Crick model say about the structure of DNA

Answer 1

Double stranded helical structure
Sugar phosphate backbone on outside
Bases on inside
Stabilised by H bonds
Two polynucleotide strands oriented in opposing directions

Question 2

What are the names of the base pairs

Answer 2

Cytosine (C) 
Thymine (T)
Adenine (A)
Guanine (G)
(C&T are Pyrimidines and A&G are purines)

Question 3

What are polynucleotides (nucleic acid)

Answer 3

Nucleotides joined together by phosphodiester bonds

Question 4

Bonds from OH of phosphate and H of sugar form water.

Answer 4

Just kinda know it

Question 5

How is this an enzyme catalysing reaction

Answer 5

Recognises and attaches to DNA, breaks high energy phosphate bonds to release energy used to catalyse reaction.

Question 6

How must two strands of DNA be organised

Answer 6

Antiparallel

5’-3’ and 3’-5’

Question 7

How many H bonds does A-T have

Answer 7

2

Question 8

How many H bonds does C-G have

Answer 8

3

Question 9

What processes do we need DNA replication for

Answer 9

Grow through life
Pregnancy
Injury repair
mitosis and meiosis