10 Questions
What is the main function of enzymes in a reaction?
To increase the rate of reaction by lowering the activation energy.
What is the active site of an enzyme?
The area of the enzyme where the reaction with the substrate takes place.
What is the induced fit model of enzyme-substrate interaction?
When the enzyme and substrate form a complex, the enzyme structure changes to fit around the substrate.
Describe the lock and key model of enzyme activity.
The idea that the substrate fits into the enzyme like a key into a lock due to their complementary shapes.
Give an example of an intracellular enzyme and its function.
DNA polymerase, involved in catalysing the formation of phosphodiester bonds.
What happens to the rate of enzyme-controlled reactions as enzyme concentration increases?
The rate of reaction increases as there are more active sites for substrates to bind to.
How does substrate concentration affect the rate of enzyme-controlled reactions?
The rate of reaction increases as concentration of substrate increases.
What effect does temperature have on enzyme-controlled reactions?
Rate of reaction increases up to the optimum temperature, then decreases beyond that point.
How does pH affect enzyme-substrate binding?
In acidic pH, H+ ions disrupt the binding, while in alkaline pH, OH- ions disrupt the binding.
What is the difference between competitive and non-competitive inhibitors?
Competitive inhibitors bind to the active site, while non-competitive inhibitors bind at another site on the enzyme known as the allosteric site.
This quiz explores the function of enzymes as proteins that speed up chemical reactions by lowering the activation energy. Learn about the specificity of enzymes for their substrates and how the active site plays a crucial role in catalysis.
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