SB1e - Enzymes and Nutrition Flashcards

1
Q

What is an enzymes?

A

it is a protein which speed up reactions by lowering the activation energy without being used up or changed themselves.

This means they can be reused again and again
* In short, enzymes are biological catalysts.

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2
Q

Explain the lock and key hypothesis.

A
  • Enzymes have a pocket called the active site
  • Substrate molecules bind to it and are catalyzed
  • In the lock and key hypothesis, the shape of the active site matches the shape of its substrate molecules - this makes enzymes highly specific.’
  • Each type of enzyme can usually catalyse only one type of reaction
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2
Q

What is denaturing and when does it occur?

A

Denaturing is altering the shape of the active site so that the substrate can no longer carry out its function

Enzymes denature when:
- Temperature above optimum
- pH values above and below their optimum pH

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2
Q

Name the 4 enzymes.

A

Amylase
catalase
starch synthase
DNA polymerase

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