name adoniah jacques 85 date 9/8/25
enzymes worksheet
1) what is a catalyst?
2) what is an enzyme?
3) what is the active site and what is its job?
4) what is a substrate?
5) what is the product?
6) explain how an enzyme works using the terms from questions 1 – 5.
7) what is denaturing and what causes it to occur?
8) what 4 things can affect the way enzymes work? explain how each thing affects an enzyme.
9) how can a lock and key be used to describe an enzyme?

Question

Accepted Answer

### Question 1: What is a catalyst?
# Brief Explanations:
A catalyst is a substance that increases the rate of a chemical reaction without being consumed or undergoing permanent chemical change. It lowers the activation energy required for the reaction to occur.
# Answer:
A catalyst is a substance that speeds up a chemical reaction (by lowering activation energy) without being used up in the process.

### Question 2: What is an enzyme?
# Brief Explanations:
Enzymes are biological catalysts, typically proteins (or sometimes RNA), that speed up chemical reactions in living organisms. They are highly specific to their substrate and function optimally under certain conditions (like specific temperature, pH).
# Answer:
An enzyme is a biological catalyst (usually a protein) that speeds up biochemical reactions in cells, being specific to its substrate and reusable.

### Question 3: What is the active site and what is its job?
# Brief Explanations:
The active site is a region on an enzyme (usually a pocket or groove) where the substrate binds. Its job is to provide a specific environment for the substrate to react, facilitating the formation of products by orienting the substrate correctly and stabilizing the transition state.
# Answer:
The active site is a region (pocket/groove) on an enzyme where the substrate binds. Its job is to allow the substrate to react (forming products) by orienting it, stabilizing the transition state, and lowering activation energy.

### Question 4: What is a substrate?
# Brief Explanations:
A substrate is the specific molecule (or molecules) that an enzyme acts on. It binds to the enzyme's active site, and the enzyme then catalyzes a reaction involving the substrate, converting it into product(s).
# Answer:
A substrate is the molecule (or molecules) that an enzyme acts on; it binds to the enzyme’s active site to undergo a reaction.

### Question 5: What is the product?
# Brief Explanations:
The product is the substance (or substances) formed as a result of the enzyme - catalyzed reaction. After the substrate reacts at the enzyme’s active site, the product(s) are released, and the enzyme is free to act on more substrate.
# Answer:
A product is the substance(s) formed from the enzyme - catalyzed reaction of the substrate.

### Question 6: Explain how an Enzyme works using the terms from questions 1 – 5.
# Brief Explanations:
1. First, recall the definitions: An enzyme is a biological catalyst (from Q2). A catalyst (Q1) speeds up reactions.
2. The substrate (Q4) binds to the enzyme’s active site (Q3). The active site’s job (Q3) is to facilitate the reaction.
3. The enzyme lowers the activation energy of the reaction between the substrate. After the reaction occurs at the active site, the product(s) (Q5) are formed and released. The enzyme is then reusable to catalyze more reactions with other substrate molecules.
# Answer:
An enzyme (a biological catalyst, Q2) speeds up a biochemical reaction (like a catalyst, Q1). The substrate (Q4) binds to the enzyme’s active site (Q3), where the active site (Q3) orients/stabilizes the substrate to lower activation energy. The substrate reacts, and product(s) (Q5) are formed and released. The enzyme is reusable for more substrate - enzyme interactions.

### Question 7: What is denaturing and what causes it to occur?
# Brief Explanations:
Denaturing is the process where an enzyme (or protein) loses its specific three - dimensional structure, including the active site. This loss of structure causes the enzyme to lose its catalytic activity (since the active site loses its specific shape). Denaturing is caused by factors that disrupt the weak bonds (like hydrogen bonds, ionic bonds) that maintain the protein's structure, such as high temperature (beyond the enzyme's optimal temperature), extreme pH (far from the enzyme's optimal pH), or exposure to certain chemicals.
# Answer:
Denaturing is the loss of an enzyme’s (protein’s) specific 3D structure (including active site shape), causing it to lose catalytic activity. It is caused by extreme conditions like high temperature, extreme pH, or certain chemicals (that disrupt bonds maintaining structure).

### Question 8: What 4 things can affect the way enzymes work? Explain how each thing affects an enzyme.
# Brief Explanations:
1. **Temperature**: Enzymes have an optimal temperature (e.g., human enzymes ~37°C). Below optimal, reaction rate increases with temperature (more kinetic energy for substrate - enzyme collisions). Above optimal, high temperature denatures the enzyme (loses active site shape), decreasing activity.
2. **pH**: Enzymes have an optimal pH (e.g., pepsin ~pH 2, trypsin ~pH 8). Deviating from optimal pH (too acidic or basic) disrupts the enzyme’s structure (including active site) via bond disruption, reducing activity or denaturing it.
3. **Enzyme Concentration**: With sufficient substrate, increasing enzyme concentration increases reaction rate (more active sites available to bind substrate). If substrate is limited, increasing enzyme concentration has less effect once all substrate is bound.
4. **Substrate Concentration**: Increasing substrate concentration (with sufficient enzyme) increases reaction rate (more substrate - enzyme collisions) until all active sites are saturated (reaction rate plateaus as no more active sites are available).
# Answer:
1. **Temperature**: Optimal temp (e.g., 37°C for human enzymes) gives max activity. Below: rate increases with temp (more collisions). Above: denatures enzyme (loses active site), rate drops.
2. **pH**: Optimal pH (e.g., pepsin ~pH 2) is best. Extreme pH (too acidic/basic) disrupts enzyme structure (active site), reducing activity/denaturing.
3. **Enzyme Concentration**: With enough substrate, more enzyme means more active sites, faster reaction. Limited substrate: effect lessens when substrate is used up.
4. **Substrate Concentration**: More substrate (with enough enzyme) increases rate (more collisions) until active sites are saturated (rate plateaus).

### Question 9: How can a lock and key be used to describe an enzyme?
# Brief Explanations:
The lock - and - key model is a way to describe enzyme - substrate specificity. The enzyme is like a lock, with a specific active site shape (the “keyhole”). The substrate is like a key, with a specific shape that fits exactly into the enzyme’s active site (the keyhole). Only the correct “key” (substrate) can fit into the “lock” (enzyme’s active site) to initiate the reaction, just as only the correct key opens a lock.
# Answer:
The lock - and - key model compares the enzyme to a lock (with a specific active site “keyhole” shape) and the substrate to a key (with a complementary shape). Only the correct substrate (key) fits into the enzyme’s active site (lock’s keyhole) to allow the reaction, like a key opening a lock.

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Explanation:

Question 1: What is a catalyst?

Answer:

Question 2: What is an enzyme?