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7 Cards in this Set
- Front
- Back
A DNA Nucleotide contains... |
1. A deoxyribose sugar 2. A phosphate 3. A base |
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What type of bonds hold the two strands of DNA together? |
hydrogen bonds |
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What are the bases and which do they bond with? |
Adenine - Thymine Cytosine - Guanine |
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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. |
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What are chromosomes? |
Tightly coiled DNA packaged around associated proteins. |
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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. |
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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 |