1. Metabolism, Catabolism and Anabolism
Aims:
Must be able to define the terms metabolism, catabolism and anabolism.
Should be able to give examples of the key terms.
Could be able to explain the importance of these process groups.

2. Metabolism
ALL the chemical reactions that take place in a cell or an organism.

3. Catabolism Breaking down of large complex molecules.
E.g. Respiration –
Glucose + Oxygen – carbon dioxide + water
E.g. Hydrolysis –
Starch – Maltose – Glucose
DNA – Mononucleotides
Reactions are usually EXERGONIC (give off energy).

4. Anabolism Synthesis of large complex molecules from small molecules.
E.g. Protein synthesis –
Amino Acids – Proteins
E.g. Polymerisation –
Mononucleotides – DNA
Many anabolic pathways are NOT the reverse of catabolic reactions.
Reactions are usually ENDERGONIC (take in energy).

5. Anabolism
The energy required for the reverse reaction is often TOO HIGH for a reaction to take place.
Many synthetic pathways use ATP and phosphorylated intermediates e.g. to synthesise Glucose is first phosphorylated using ATP –
Glucose + ATP = Glucose phosphate + ADP, energy level then raised to condense with other molecules to form starch.

6. Activity
Answer the questions from page 38 in Biozone book.