Biology- DNA
- Created by: Katie Elliot
- Created on: 07-04-15 15:43
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- DNA
- Made up of monomers called nucleotide
- this has 3 parts: Phosphate, Deoxyribose (sugar) and a base
- There are 4 different bases in DNA these are: Adenine, Thymine, Guanine and Cytosine
- Adenine pairs with Thymine
- Guanine pairs with Cytosine
- There are 4 different bases in DNA these are: Adenine, Thymine, Guanine and Cytosine
- this has 3 parts: Phosphate, Deoxyribose (sugar) and a base
- Has 2 polynucleotide strands twisted around each other to form a Double Helix
- Hydrogen bonds between bases= weak. So the double helix protects the bonds in the centre of the molecule. so the code isn't corrupted
- How does the structure relates to function?
- Long= store lots of information
- Complementary base pairs= replicates accurately
- Base pairs protected inside by sugar phosphate backbone= stable
- Weak hydrogen bonds= replicates by strands unzipping
- Semi conservative replication
- Step 1: Hydrogen bonds broken by an enzyme
- Step 2: Strands separate exposing bases but strands are kept intact
- Step3: DNA polymerase enzyme attaches free nucleotides to exposed bases
- Step 4: New strand is built on original strands as the complementary bases fit together
- Is where one strand in each molecule contains the original parent strand and a newly synthesised strand
- Made up of monomers called nucleotide
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