Cell Reproduction 7th 16.3 DNA

DNA

DNA DNA – code that controls all the activities of a cell DNA stands for deoxyribonucleic acid Rosalind Franklin discovered a spiral form using X-rays Watson and Crick determined the double helix form

DNA

DNA DNA is composed of nitrogen bases and sugar phosphate molecules. Adenine and Thymine Cytosine and Guanine There is always a perfect amount of each pair. Before mitosis, each strand separates to create a whole other DNA molecule.

DNA

DNA Gene – section of DNA that controls the production of amino acids and proteins Proteins are used to either build cells or work as enzymes Proteins are made by ribosomes Ribosomes receive messages from RNA.

DNA

DNA Mutation – a permanent change in genes caused by outside forces Genetic disorders Tay-Sachs, Huntingtons, Down Syndrome, Fragile X, hemophilia.

DNA