Topic 12

Question 1

Enzymes defenition

Answer 1

biological catalysts that speed up chemical reactions in living organisms

Question 2

6 functions of enzymes

Answer 2

Reduce energy required to initiate chemical reaction
Can only be the catalyst for a single reaction
Synthesise new/ break down substances
Speed up reaction without being used up and remains unchanged
Specific in action
Made up of proteins

Question 3

Describe the lock and key mechanisms

Answer 3

Substrate has complementary shape to fit in active site of enzyme, substrate binds to active site forming enzyme substrate complex, reactions occur to convert substrate to products

Enzyme is the lock, substrate is the key

Question 4

Temperature effect on enzyme

Answer 4

increases particle speed, increasing chance of collisions, increases rate of reaction to optimum temperature
After optimum temperature, bonds in enzymes break, causing enzyme to denature

Question 5

pH level effect on enzyme

Answer 5

more acidic solutions slow down reaction
curve is symmetrical for graph