B1.2.4 - Enzyme Reactions Flashcards Preview

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Flashcards in B1.2.4 - Enzyme Reactions Deck (16):
1

What are the conditions in which enzymes work the best?

Optimum conditions

2

What are the factors that affect the efficiency of enzyme-catalysed reactions?

Temperature
pH
The concentrations of the enzyme and the substrate

3

What happens to enzymes at higher molecules?

The enzyme and substrate molecules move faster and collide more often

4

What happens to the enzyme-catalysed reaction when the temperature is higher?

Generally, it speeds up

5

What happens if the temperature during enzyme-catalysed reactions becomes too high?

The amino acid chains in the protein begin to unravel, changing the shape of the active site.

6

How does an enzyme become denatured?

When the shape of the active site begins to change because of the unravelling of amino acid chains

7

What happens when the enzyme is denatured?

The substrate can no longer bind and so the rate of reaction decreases

8

What happens if all the enzyme molecules become denatured?

The reactions stops

9

Can denatured enzymes become regular enzymes again?

No, the change is irreversible

10

What is the optimum pH for enzymes?

Every enzyme has a different optimum pH

11

How does a change in pH affect an enzyme molecule?

It may make the enzyme unfold, changing the shape of the active site and making the enzyme denatured.

12

What happens to an enzyme reaction if the substrate concentration is high?

Generally, the reaction is faster

13

What happens if the substrate concentration becomes too high?

It reaches its maximum reaction rate and cannot increase in speed any further

14

What happens to an enzyme reaction if the enzyme concentration is high?

Generally, it is faster

15

What happens at a certain substrate concentration?

The enzyme molecules are bound to the substrate molecules

16

What happens if no new substrate molecules are added to the enzyme reaction?

It will stop