Multiple Choice
Which of the following is changed by the presence of an enzyme in a reaction? and
3. Energy & Cell Processes
Enzymes
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Which of the following statements about the active site of an enzyme is correct?
A
The active site has a fixed structure (shape).
B
Coenzymes are rarely found in the active site of an enzyme.
C
The structure of the active site is not affected by changes in temperature.
D
The active site allows the reaction to occur under the same environmental conditions as the reaction without the enzyme.
E
The active site may resemble a groove or pocket in the surface of a protein into which the substrate fits.
Verified step by step guidance1
Understand the concept of an enzyme's active site: The active site is a specific region of the enzyme where the substrate binds and the chemical reaction occurs. It is typically a groove or pocket on the enzyme's surface.
Consider the flexibility of the active site: The active site is not rigid; it can change shape slightly to accommodate the substrate, a concept known as 'induced fit.' This flexibility is crucial for the enzyme's function.
Evaluate the role of coenzymes: Coenzymes are organic molecules that bind to the enzyme and assist in the catalytic process. They are often found in or near the active site, playing a vital role in the enzyme's activity.
Assess the impact of temperature on the active site: Temperature changes can affect the enzyme's structure, including the active site. High temperatures may denature the enzyme, altering the active site's shape and function.
Compare the environmental conditions with and without the enzyme: Enzymes lower the activation energy required for reactions, allowing them to occur more efficiently under physiological conditions than they would without the enzyme.
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