A Level Biology Enzymes

Which part of the enzyme is responsible for its specificity?

• Active site

• Allosteric site

• Substrate

• Inhibitor

What is the effect of pH on enzyme activity?

• Enzymes are not affected by pH

• Each enzyme has an optimal pH range

• Enzymes work best at pH 7

• Enzymes are denatured at any pH

Which of the following is an example of competitive inhibition?

• A molecule binds to the active site, preventing substrate binding

• A molecule binds to an allosteric site, changing the enzyme's shape

• A molecule permanently inactivates the enzyme

• A molecule increases the enzyme's activity

Which of the following is a common industrial application of enzymes?

• Enzymes are used to synthesise DNA

• Enzymes are used in the production of antibiotics

• Enzymes are used to break down pollutants

• Enzymes are used to create artificial flavours

What is the effect of increasing substrate concentration on enzyme activity when the enzyme is saturated?

• The reaction rate will increase indefinitely

• The reaction rate will decrease

• The reaction rate will remain constant

• The enzyme will be denatured

Which of the following statements about enzyme inhibitors is true?

• All inhibitors are irreversible

• Non-competitive inhibitors bind to the active site

• Competitive inhibitors can be overcome by increasing substrate concentration

• Inhibitors increase the rate of enzyme activity

What is the role of cofactors in enzyme activity?

• They act as substrates

• They provide energy for the reaction

• They assist in enzyme function

• They inhibit enzyme activity

Which enzyme is commonly used in the dairy industry to produce lactose-free milk?

• Amylase

• Lactase

• Protease

• Lipase

Enzymes are capable of increasing the rate of a chemical reaction within a living cell.  Enzymes accomplish this through which of the following means?

• reducing the number of products   
• reducing the activation energy
• increasing the temperature of the cell
• increasing the concentration of reactants 

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Enzymes are...

• nucleic acids
• proteins
• lipids
• carbohydrates

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