Adenine (A) - Thymine (T), Guanine (G) - Cytosine (C), DNA structure - Double helix, composed of sugar-phosphate backbone and bases, Gene - section of DNA, codes for one protein, Chromosome - length of DNA (human body cells contain 23 pairs), DNA base sequence - Determines the sequence of amino acids in a protein, Protein shape - determined by the sequence of amino acids, protein function - determined by the shape of protein active site, mRNA - carries the complementary code from the DNA out of the nucleus to a ribosome, complementary pairing - holds bases together, bases always pair in a particular way (A-T, G-C), ribosome - mRNA is decoded and the correct amino acids are assembled, bases - four bases A, T, G + C (Adenine, thymine, guanine and cytosine), amino acid sequence - determines a proteins shape and function,

National 5 biology 1.3 DNA + proteins

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