cellular control

• A-T bond has two bonds
• C-G has three bonds
• what are the two purines?


  adenosine and guanine
• what are the three pyrimidines?


  uracil, cytosine and thiamine
• gene: each gene contains different sequence of bases on a fixed position on a strand of DNA
• chromosome: section of DNA which contains a gene
• double helix: two twisted strands around an axis connected in the centre by hydrogen bonding
• degenerate: more than one codon that codes for each amino acid
• non-overlapping: each base sequence is only read once
• universal code: same codon codes for same amino acid in all codes