topic: enzymes – reading preap
option 2: reading
reading to learn: the role of enzymes
student worksheet
1. what are enzymes?
2. what does it mean when an enzyme denatures? how is enzyme activity affected by this?
3. explain the difference between an anabolic reaction versus a catabolic reaction.
4. why are enzymes labeled as a catalyst? your answer cannot use the word efficient.
label the substrate, active site, enzyme, enzyme - substrate complex, and products.
diagram with labels: substrate entering active site of enzyme, enzyme/substrate complex, enzyme changes shape slightly as substrate binds, products active site ...

Question

Accepted Answer

### Question 1: What are enzymes?
# Brief Explanations:
Enzymes are biological catalysts, typically proteins (some RNA can act as enzymes too), that speed up chemical reactions in cells by lowering the activation energy. They are specific to their substrates and are not consumed in the reaction.
# Answer:
Enzymes are biological catalysts (usually proteins, some RNA) that speed up cellular chemical reactions by lowering activation energy, are substrate - specific, and not consumed in reactions.

### Question 2: What does it mean when an enzyme denatures? How is enzyme activity affected by this?
# Brief Explanations:
Denaturation means an enzyme (a protein - based enzyme) loses its specific three - dimensional structure, including the active site, due to factors like high temperature or extreme pH. When denatured, the active site loses its specific shape, so the enzyme can no longer bind to its substrate effectively, and enzyme activity (the rate of the catalyzed reaction) decreases or stops.
# Answer:
Denaturation: Enzyme (protein - based) loses 3D structure (including active site) due to factors like extreme temp/pH. Enzyme activity: Active site shape is lost, so substrate binding fails, and reaction rate drops/stops.

### Question 3: Explain the difference between an anabolic reaction versus a catabolic reaction.
# Brief Explanations:
Anabolic reactions build complex molecules from simpler ones, requiring energy (endergonic), e.g., photosynthesis (building glucose from CO₂ and H₂O). Catabolic reactions break down complex molecules into simpler ones, releasing energy (exergonic), e.g., cellular respiration (breaking down glucose to release energy).
# Answer:
Anabolic: Builds complex from simple, endergonic (needs energy), e.g., photosynthesis. Catabolic: Breaks complex into simple, exergonic (releases energy), e.g., cellular respiration.

### Question 4: Why are enzymes labeled as a catalyst? Your answer cannot use the word efficient.
# Brief Explanations:
Catalysts speed up chemical reactions without being consumed or permanently altered in the reaction. Enzymes do this by lowering the activation energy of the reaction, and they remain unchanged at the end of the reaction, so they meet the definition of a catalyst.
# Answer:
Enzymes are catalysts because they speed up chemical reactions, lower activation energy, and are not consumed or permanently altered during the reaction.

### Labeling the Enzyme - Related Diagram
# Brief Explanations:
- Substrate: The molecule(s) that bind to the enzyme's active site. In the diagram, the "Substrate entering active site of enzyme" arrow points to the substrate (the small molecule(s) approaching the enzyme).
- Active Site: The region on the enzyme where the substrate binds. It's the specific pocket/area on the enzyme (the dark - colored structure) that the substrate fits into.
- Enzyme: The large protein (or RNA) molecule that catalyzes the reaction. In the diagram, the dark - colored, globular structure is the enzyme.
- Enzyme - Substrate Complex: Formed when the substrate binds to the enzyme's active site. In the diagram, the structure labeled "Enzyme/substrate complex" is this complex.
- Products: The molecules formed after the enzyme - catalyzed reaction. They are the molecules that leave the enzyme's active site after the reaction.
# Answer:
- Substrate: The small molecule(s) (e.g., the ones with the arrow "Substrate entering active site of enzyme" pointing to them).
- Active Site: The specific region on the enzyme (dark - colored structure) where substrate binds.
- Enzyme: The large, dark - colored globular structure.
- Enzyme - Substrate Complex: The structure labeled "Enzyme/substrate complex".
- Products: The molecules that leave the enzyme's active site after the reaction (the ones shown leaving the enzyme at the end of the diagram sequence).

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QUESTION IMAGE

Question

Explanation:

Question 1: What are enzymes?

Answer:

Question 2: What does it mean when an enzyme denatures? How is enzyme activity affected by this?