Topic 3 - DNA Structure

Question 1

What is the structure of DNA

Answer 1

DNA is:
- two strands coiled up together to resemble a twisted ladder called a double helix
- each strand is made of phosphate and sugar
- strands also contain rungs on the inside which are made up of complementary bases and hold the strands together

Question 2

How does the structure of DNA help it carry out its function?

Answer 2

• it can coil up and be able to store lots of information
• allows genes to be carried from parent to child

Question 3

Which rungs go together?

Answer 3

Adenine and thymine
Cytosine and guanine