BRAINCAKEExtracellular Enzymes
Cellular reactions require substrates.
All substrates are obtained from the environment.
Many of the materials obtained from the environment are large molecules which must be broken down into smaller, simpler molecules before they can be used by the cells for anabolic or catabolic reactions.
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Key terms in this lesson
- polymer
- A large molecule made of many repeating monomer units joined by covalent bonds.
- ATP
- Adenosine triphosphate, a nucleotide that acts as the immediate energy source of a cell, releasing energy when hydrolysed to ADP and inorganic phosphate.