Enzymes, Calories & Metabolism (Digestive System)

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Last updated 12:35 AM on 4/24/26
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9 Terms

1
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What is an enzyme?

A biological catalyst that speeds up biochemical reactions.

2
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What is the active site?

The region on an enzyme where substrates bind.

3
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What is an enzyme‑substrate complex?

Temporary binding of enzyme + substrate during reaction.

4
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What is synthesis (in enzyme action)?

Enzymes building larger molecules from smaller substrates.

5
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What is degradation (in enzyme action)?

Enzymes breaking down molecules into smaller products.

6
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What is a Calorie (kcal)?

Energy needed to raise 1 kg of water by 1°C.

7
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What is metabolism?

Chemical processes that convert food into energy (ATP), heat, and waste.

8
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What is ATP?

The body’s energy currency.

9
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What is the order in which the body burns energy sources?

1) Blood glucose

2) Glycogen

3) Fats

4) Proteins