Unit 3 - C Enzymes

AS LEVEL
B I O LO GY

,3 Enzymes ...............................................................3

3.1 Mode of action of enzymes ..........................................3
Mode of action of enzymes ..........................................3
3.2 Factors that affect enzyme action .................................8

Factors that affect enzyme action .................................8
Comparing enzyme affinities .......................................11
Enzyme inhibitors .......................................................14
Immobilizing enzymes ................................................15
.

, 3 ENZYMES
Enzymes are essential for life to exist. Their mode of action and the factors
activity are explored in this section. Prior knowledge for this section is an un
that an enzyme is a biological catalyst that increases the rate of a reaction
unchanged when the reaction is complete.


There are many opportunities in this section for candidates to gain experien
out practical investigations and analyzing and interpreting their results.


Candidates will be expected to use the knowledge gained in this section to
in familiar and unfamiliar contexts.



3 .1 M O D E O F A C T I O N
ENZYMES
There are many different enzymes, each one specific to a particular reactio
specificity is the key to understanding the efficient functioning of cells and li


LEARNING OUTCOMES

C ANDIDATES SHOULD BE ABLE TO:

A. explain that enzymes are globular proteins that catalyze metabolic rea


Mode of action of enzymes

- Enzymes are protein molecules which can be defined as biological cataly
molecule which speeds up chemical reaction but remains unchanged at en
Virtually every metabolic reaction which takes place within living organism
an enzyme and enzymes are therefore essential for life to exist; many enzy