Living and Growing B3 OCR Gateway
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- Created on: 25-01-16 12:04
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- Living and Growing B3
- Cells
- Animal cell Structure
- Nucleus-Contains DNA in the form of chromosomes
- Ribosome- Where proteins are synthesised.
- Bacterial Cell Structure
- Bacteria dont have chloroplasts or mitochondria
- Cell membrane
- Cell wall
- Animal cell Structure
- DNA
- Chromosomes are made of DNA
- Chromosomes are long molecules of coiled up DNA. The DNA id divided up into short sections called genes.
- Each nucleotide contains a small molecule called a ''base''. DNA has four different bases
- Each base forms cross links to a base on the other strand. This keeps the two DNA strands tightly wound toghether.
- A always pairs up with T, and C always pairs up with G. This is called complementary base pairing.
- Each nucleotide contains a small molecule called a ''base''. DNA has four different bases
- DNA is a double helix. Each of the two DNA strands is made up of lots of small groups called ''nucleotides''.
- You only need to know the four bases by their first initials - A,C,G and T.
- Chromosomes are long molecules of coiled up DNA. The DNA id divided up into short sections called genes.
- Watson and Crick
- Scientists struggled for decades to work out the structure of DNA.
- They used data from other scientists to help them understand the structure of the molecule. This included: X-ray data showing that DNA is a double helix formed two chains wound together. Other data showing that bases occurred in pairs.
- Scientists struggled for decades to work out the structure of DNA.
- DNA can replicate itself.
- In order to copy itself, the DNA double helix first 'unzips' - to form two single strands.
- The result is two double-stranded molecules of DNA that are identical to the original molecule of DNA.
- New nucleotides then join on using complemantary base-pairing. This makes an exact copy of the DNA on the other strand.
- In order to copy itself, the DNA double helix first 'unzips' - to form two single strands.
- Chromosomes are made of DNA
- Cells
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