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Module 1 Cell Function: Diffusion in Cells

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Module 1 Cell Function: Diffusion in Cells

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Questions and Answers

What happens to the rate of reaction as temperature increases towards the optimal level?

The rate of reaction increases due to more collisions between substrate and enzyme. (correct)

The rate of reaction remains constant due to the energy limitation in the system.

The rate of reaction decreases because enzymes denature more quickly.

The rate of reaction becomes unpredictable as the system reaches optimal temperature.

Why does the enzyme denature past the optimal temperature?

The heat alters the chemical bonds within the protein, changing the shape of the active site. (correct)

The cooling effect causes a structural rearrangement in the enzyme.

The heat increases the number of active sites available for substrate binding.

The enzyme becomes more efficient at higher temperatures.

How does pH affect enzymes?

pH has no effect on enzymes.

Extremes of pH can denature enzymes by interfering with their chemical structure. (correct)

High pH levels promote enzyme-substrate complex formation.

Low pH levels enhance enzyme activity by stabilizing the protein structure.

What happens to the rate of reaction when substrate concentration increases?

The rate of reaction increases until all enzymes are engaged in enzyme-substrate complexes. Signup and view all the answers

What happens when all enzymes are engaged in enzyme-substrate complexes?

The rate of reaction plateaus as enzymes reach maximum efficiency. Signup and view all the answers

Why do enzymes have an optimal temperature?

To enable them to work most efficiently within a certain temperature range. Signup and view all the answers

How does low temperature affect enzyme-substrate interactions?

It slows down the interactions because molecules move slower. Signup and view all the answers

What occurs when enzymes denature due to high temperatures?

The shape of their active site changes, preventing substrate interactions. Signup and view all the answers

Why do pH levels that are too acidic or too alkaline lead to enzyme denaturation?

They interfere with the chemical structure of enzymes, affecting protein shape. Signup and view all the answers

What happens when all enzymes are occupied in enzyme-substrate complexes?

The rate of reaction plateaus as enzymes reach their maximum efficiency. Signup and view all the answers