Enzyme Activity and Models

How does pH affect enzyme activity?

• Optimal pH results in the best enzyme activity; other pH levels decrease activity.

• Enzymes are not affected by pH levels at all.

• Higher pH always increases enzyme activity regardless of the enzyme type.

• Lower pH levels always enhance enzyme activity.

What happens when an enzyme is denatured?

• The enzyme becomes more active.

• The shape of the enzyme is changed.

• The enzyme is destroyed completely.

• The enzyme's substrate affinity increases.

Label the lack and key model

• A model explaining that substrates match with specific enzymes based on shape.

• A theory that describes the random interaction between enzymes and substrates.

• A concept that states all enzymes can bind to any substrate without specificity.

• A model that illustrates the energy changes during enzyme reactions.

Why is it important for the enzyme's active site to have a specific shape?

• To match the substrate function in order to connect to the enzyme.

• To allow the enzyme to function at any temperature.

• To increase the enzyme's overall mass.

• To prevent the substrate from binding to the enzyme.

How do inhibitors affect enzyme activity?

• They enhance enzyme activity.

• They prevent or stop enzymes from functioning.

• They increase the rate of reaction.

• They change the enzyme's structure.

Why are enzymes specific to their substrates?

• Enzymes are specific to their substrates based on shape to perform a specific function.

• Enzymes can bind to any substrate regardless of shape.

• Enzymes change their shape to fit any substrate.

• Enzymes are specific due to their temperature sensitivity.

Describe the lock and key model in words

• The parts fit like a key inside a lock; substrates match with specific enzymes based on shape

• Enzymes can change shape to fit any substrate like a flexible key

• Substrates are broken down by enzymes without any specific shape matching

• The lock and key model describes how all enzymes work in the same way regardless of shape

How does temperature affect enzyme activity?

• Low temperatures increase enzyme activity; high temperatures have no effect.

• Low temperatures decrease enzyme activity; high temperatures denature the enzyme, so it cannot function.

• Temperature has no effect on enzyme activity; it remains constant.

• Enzymes work best at low temperatures and are destroyed at high temperatures.