DNA
- Created by: keyaan Martin
- Created on: 03-02-18 15:08
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- DNA
- What is DNA made of
- DNA is strands of polymers made up of Nucleotides
- Each nucleotide consists of one sugar molecule, on phosphate molecule and one base. This makes the backbone of the DNA
- There are four different bases joins to each sugar, A(adenine),T(thymine),C(cytosine),G(guanine)
- A always joins up with T and C always joins up with G to form a weak hydrogen bond
- DNA is strands of polymers made up of Nucleotides
- Chromosomes are long, coiled up molecules in DNA. They are found in the nucleus. A gene is a section of the DNA controlling a particular protein
- Extracting DNA
- Add some ice-cold alcohol to the filtered mixture
- Filter the mixture to get the froth and insoluble bits out
- The DNA will start to come out as its not soluble with cold Alcohol.
- It will appear as a stringy white precipitate
- Mash some strawberries and put in a beaker with detergent and salt
- The salt helps bind the DNA
- The detergent breaks down the cell membranes to release the DNA
- Hydrogen bonding
- A slightly negative charged part of one base attracts positively charged part of another base. This forms a weak hydrogen bond
- C and G form three hydrogen bonds and A and T only form two explaining why the pairs only pair with the partner
- What is DNA made of
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