Enzymes Q Flashcards
Explain how the shape of an enzyme molecule is related to its function
- specific 3D tertiary structure
- specific complementary shape
- substrate can bind to active site
An enzyme catalyses only one reaction. Explain why
- enzyme has active site
- only 1 substrate fits the active site
Describe the induced-fit model of enzyme action
- before reaction, active site not complementary to substrate
- shape of active site changes as substrate binds as E-S complex forms
- bending bonds in substrate leading to reaction
Explain how enzyme models have changed over time
1 - lock and key, 1 enzyme, 1 substrate
2 - induced fit - 1 enzyme, multiple substrates, more flexible, active site moules
Compare 2 models fo enzyme action
Lock and key - active site rigid, active site an exact fit with substrate, substrate binds to active site and enzymes break bonds (catabolic)
Induced fit - active site rigid, active site moulds around substrate, binding of substrate to active site causes change
Give an example of an intracellular process and how it could effect a cell
Respiration - ATP production
Give an example of an intracellular process and how it could effect a whole organism
Protein synthesis - link to cell cycle, mitosis and growth
Give an example of an extracellular process and how it could effect a cell
Digestion - hydrolysis of large insoluble molecules into small soluble molecules so they can be absorbed
Give an example of an extracellular process and how it could effect a whole organism
Blood clotting process