OCR F215 - Module 1 - Cellular Control - How DNA Codes for Proteins

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Gene: Length of DNA that codes for 1+ polypeptides.

Polypeptide: Chain of Amino Acids joined by peptide bonds.

Each Chromosome consists of one molecule of DNA, each gene is just part of a DNA molecule.

Genes code for Polypeptides such as:

  • Antigens
  • Collagen
  • Enzymes
  • Electron Carriers
  • Haemoglobin

Locus: Specific place on the chromosome.

DNA Contains 4 bases: Adenine (A), Thymine (T), Cytosine (C), Guanine (G).

Complementary Base Pairing: A-T, C-G

RNA Bases: A U C G


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