Molecules of life

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  • Molecules of Life (B3)
    • When cells are looked at under high magnification, you can see small structures of cytoplasm
      • In the nucleus the cytoplasm have structures called mitochondria
        • In the mitochondria respiration happens, which provides energy for life processess
          • In the nucleus there are chromosomes which contain the code
      • The number of mitochondria in the cytoplasm of a cell depends on the activity of the cell
        • This is because respiration occurs in the mitochondria
    • The chromosomes  in the nucleus are made of DNA
      • DNA is made of two strands coiled to form a double helix
        • DNA cant leave the nucleus
          • Proteins are made in the cytoplasm
          • A copy of the gene need to be made so it can leave the nucleus
        • Each strands contains a chemical called bases
          • Four different bases, with cross links between the strands by pairs of bases
      • DNA contains the genetic code
        • The information is in the form of genes
          • Genes control the activity of the cell and the organisms by coding for proteins
            • The proteins that a cell produces are needed for growth and repair
      • Each gene: is a section of a chromosome made of DNA - Codes for a particular protein
        • Each gene contains a different sequence of bases


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