CIE IGCSE Enzymes

Front

What are reactants in a chemical reaction?

Back

Reactants are the substances that undergo change during a chemical reaction. They are the starting materials that are transformed into products.

Front

How do enzymes increase the rate of a chemical reaction?

Back

Enzymes increase the rate of a chemical reaction by reducing the activation energy required for the reaction to occur.

Front

What is the optimal pH for enzyme activity?

Back

The optimal pH is the specific pH level at which an enzyme functions most effectively. For some enzymes, this can be around pH 9.

Front

What type of reaction is a catabolic reaction?

Back

A catabolic reaction is a type of metabolic reaction that breaks down larger molecules into smaller ones, releasing energy in the process.

Front

What is a substrate in the context of enzymes?

Back

A substrate is any substance that is acted upon by an enzyme during a chemical reaction.

Front

What is the role of a catalyst in a chemical reaction?

Back

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.

Front

What is the difference between products and reactants?

Back

Reactants are the starting materials in a chemical reaction, while products are the substances formed as a result of the reaction.

Front

What is activation energy?

Back

Activation energy is the minimum amount of energy required to initiate a chemical reaction.

Front

What is an anabolic reaction?

Back

An anabolic reaction is a type of metabolic reaction that builds larger molecules from smaller ones, often requiring energy.

Front

What is a coenzyme?

Back

A coenzyme is a non-protein organic molecule that assists enzymes in catalyzing reactions.