2.4 enzymes Flashcards Preview

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Flashcards in 2.4 enzymes Deck (31):
1

What type of protein are enzymes?

Globular proteins

2

Are enzymes soluble? Why?

• yes
• due to the presence of many hydrophilic side groups

3

What are enzymes necessary for?

Building up large polymer based components which make cells, which make tissues, which make organs, which make organ systems

4

How many enzymes are there?

Thousands

5

What is the difference between each enzyme?

Each one is specific for a specific reaction, as each has a specific active site to fit a specific substrate

6

What sort of reactions do enzymes catalyse?

Anabolic and catabolic reactions

7

What are anabolic reactions?

Reactions that build something up

8

What are catabolic reactions?

Reactions that break something down

9

What type of reactions are catalysed by enzymes?

Both anabolic and catabolic reactions

10

In catabolic reactions where is energy released from?

Large organic molecules such as glucose

11

Where do anabolic reactions get energy from in order to occur?

Catabolic reactions

12

What are anabolic reactions necessary for?

Building up and growing

13

Define METABOLISM:

The sum of all the different reactions and reaction pathways happening in all organisms

14

Why can metabolism happen?

Due to the control and order imposed by enzymes

15

What part of the enzyme is involved in catalysis?

The active site

16

What is enzyme shape determined by?

The sequence of amino acids in its structure and the bonds between the atoms in that structure

17

Why do different types of enzymes have different shapes and functions?

Because the order and type of amino acids in their structure is different

18

What is enzyme specificity?

Only substrate with the exact shape to fit in the active site will bond to the enzyme and react

19

What are enzymes?

Biochemical catalysts that speed up reactions without being used up

20

What do molecules in solution do?

Move and collide randomly

21

For a reaction to occur what do molecules need to do?

Collide in the right orientation

22

What is activation energy?

The amount of energy that needs to be supplied to the chemicals/reactants before a reaction will start

23

How is activation energy often supplied?

As heat

24

What role do enzymes play with reference to activation energy?

They reduce the activation energy needed to make a reaction happen
• lowering temperature
• speeding up the rate of reaction

25

What formation lowers activation energy?

The formation of the enzyme substrate complex

26

Why does the formation of the enzyme substrate complex, lower activation energy, in a reaction where substrate is joining?

•two substrate molecules joining
•attaching to the enzyme holds them close together
• reduces repulsion
• molecules bond more easily

27

Why does the formation of the enzyme substrate complex, lower activation energy, in a reaction where the enzyme is catalysing a breakdown?

• breakdown reaction
• fitting into the active sites puts strain on the bonds in the substrate
• substrate molecules break up more easily

28

What does the lock and key model say?

In the same way only the right key will fit into a lock only a specific substrate will fit the active site of the enzyme

29

How does the lock and key model work?

• substrate enters
• substrate binds to active site
• enzyme substrate complex forms
• products form in enzyme products complex
• products released
• enzyme left unchanged

30

What does the induced fit hypothesis say?

Recent research suggests the active site of the enzyme changes shape slightly as the substrate enters

31

How does the induced fit hypothesis work?

• substrate enters
• as substrate hinds active site changes shape slightly
• enzyme substrate complex formed
• enzyme product complex formed
• products released

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