Enzymes (9 white) by Tehmina Abrar - 59673/TCHR/BSR

2025-03-19 15:32:56 UTC

Explain how temperature or pH affects enzyme activity.
Enzymes work best at an optimum temperature and pH. If the temperature is too high, the enzyme becomes denatured, changing the shape of the active site. This prevents the substrate from binding, so the reaction slows down or stops.

2025-03-19 16:58:10 UTC

Explain how enzymes work using enzyme–substrate terminology.

Enzymes have an active site where the substrate binds. This forms an enzyme–substrate complex. The enzyme lowers activation energy and converts the substrate into products. The enzyme remains unchanged and can be reused.

2025-03-22 07:26:31 UTC

What is an enzyme? Give one example.

An enzyme is a protein that speeds up chemical reactions in the body.
Example: Amylase helps break down starch into sugar in the mouth.

tehminaabrar — 2025-12-30 08:39:23 UTC

An enzyme is a biological catalyst that helps chemical reactions happen faster in living organisms.
Example: Catalase breaks down hydrogen peroxide into water and oxygen.

tehminaabrar — 2025-12-30 08:40:27 UTC

An enzyme has a specific active site that matches its substrate. When the substrate binds to the active site, an enzyme–substrate complex is formed. The enzyme then converts the substrate into products and is free to be used again.

tehminaabrar — 2025-12-30 08:41:57 UTC

Enzyme activity increases as temperature rises because molecules move faster. However, very high temperatures or extreme pH values cause the enzyme to lose its shape (denaturation). When this happens, the substrate can no longer fit into the active site, so the reaction stops.

tehminaabrar — 2025-12-30 08:43:42 UTC

Why are enzymes specific to their substrates?

Enzymes are specific because their active site has a shape that only fits a particular substrate, like a lock and key.

tehminaabrar — 2025-12-30 08:45:11 UTC

Each enzyme works with only one type of substrate due to its complementary shape, ensuring only the correct reaction occurs.

tehminaabrar — 2025-12-30 08:45:52 UTC

What happens to an enzyme after it catalyzes a reaction?

After the reaction, the enzyme is unchanged and can catalyze the same reaction again with new substrate molecules

tehminaabrar — 2025-12-30 08:46:09 UTC

Enzymes are reusable because they do not get used up or permanently altered during the reaction