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7 Cards in this Set

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  • Back

A DNA Nucleotide contains...

1. A deoxyribose sugar


2. A phosphate


3. A base



What type of bonds hold the two strands of DNA together?

hydrogen bonds

What are the bases and which do they bond with?

Adenine - Thymine


Cytosine - Guanine

Describe the structure of DNA?

2 anti-parallel strands that, each with a deoxyribose (3') end and a phosphate (5') end, coiled into a double helix.

What are chromosomes?

Tightly coiled DNA packaged around associated proteins.

What does DNA polymerase do?

DNA polymerase synthesises a new strand of DNA by adding the bases complementary to the template strand. It needs the primer to work.

Why can DNA polymerase only add nucleotides to the DEOXYRIBOSE (3') end?

- Due to the configuration of nucleotides.


- This results in DNA only working in a 5' to 3' direction, meaning one strand is replicated continuously known as the LEADING STRAND.


- The other is replicated in fragments known as the lagging strand.


- The fragments are then joined by LIGASE