Tuesday, November 24, 2009

[Biology Form 4] Enzymes Extraordinaire II

D is for definition
4. Define enzyme
An enzyme is a biological catalyst that speeds up the rate of chemical reactions occurring in living organisms.

D is also for definition (The Where question)
5. Where are enzymes synthesised in a cell?
In ribosomes.

6. Where are enzymes modified and packaged in a cell?
In the Golgy body.

E is for examples and effects
7. Example: State an example of enzymes involved in the digestion or hydrolysis of each of the following substrates:
a) Starch - Amylase
b) Proteins - Pepsin
c) Fats - Lipase
d) Maltose - Maltase
e) Lactose - Lactase
f) Sucrose - Sucrase
g) Cellulose - Cellulase

8. Effect: What would be the effect on digestion if enzymes were unavailable?
Digestion would be slowed down drastically.

F is for factors
9. State four factors that affect enzyme activity.
Temperature, pH, enzyme concentration and substrate concentration.

G is for graphs
10. Sketch a graph for each of the factors on enzyme activity. Label the x-axis and y-axis correctly.


  1. teacher, i'm a form 5 student who's now sitting for spm. i would like to know whether the spm marker would mark all the essays that i've answered if i do more than 2 essays? thank you.

  2. all essays answered will b mark, but the mark/point counted on top 2 best score

  3. thank u for ur effective notes

  4. teachers, i'm a form 4 student who a new student and dont know how to answer the question perpectly...expecially in paper 3..can you lead me how to answer that question?

  5. teacher,,
    what is uses of enzyme in our daily life and industrial processes??


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