B.1 DNA

Question 1

DNA … helix

Answer 1

Double helix structure.

paired bases.

Question 2

Chromosomes

Answer 2

• long molecules of coiled up DNA. divided into small sections called genes.

Question 3

Double helix

Answer 3

• each of the two DNA strands are made up of lots of nucleotides joined together in a long chain.
  THIS MAKES DNA A POLYMER

Question 4

Bases

Answer 4

• each nucleotide contains four bases (two pairs).
• A (adenine)
• C (cytosine)
• G (guanine)
• T (thymine)

Question 5

Bases (2)

Answer 5

• each base forms cross links to a base on the other strand.

- keeps the strands tightly wound together

Question 6

Pairs

Answer 6

• A and T
• C and G
• complimentary base-pairing.

Question 7

nucleotides

Answer 7

• contain sugar, phosphate group and a base.

- are monomers