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IGCSE Biology Revision Units 3-5
Test Description: Unit 3 Movement in and out of cells Unit 4 Biological molecules Unit 5 Enzymes
Instructions: Answer all questions to get your test result.
1) Bond that joins amino acids in a protein molecule.
A
hydrogen
B
peptide
C
ionic
D
ester
2) Which is NOT a DNA base pair?
A
A-T
B
C-G
C
G-C
D
A-C
3) Which process relies on water being a solvent?
A
transpiration
B
osmosis
C
evaporation
D
boiling
4) Which is NOT a complex carbohydrate?
A
glucose
B
starch
C
glycogen
D
cellulose
5) What is the composition of 1 molecule of fat?
A
3 molecules of fatty acid, 1 molecule of glycogen
B
3 molecules of glycogen, 1 molecule of fatty acid
C
3 molecules of fatty acid, 1 molecule of glycerol
D
3 molecules of glycerol, 1 molecule of fatty acid
6) Which is NOT needed for osmosis to occur?
A
concentration gradient
B
partially permeable membrane
C
water
D
carrier protein
7) Which is NOT a site of active transport?
A
Villi in small intestines
B
Root hair cell
C
Bowman's capsule
D
Kidney tubules
8) A plant cell placed in distilled water will...
A
be turgid
B
be flaccid
C
burst
D
be plasmolysed
9) Which two structures have a complementary shape?
A
enzyme active site and substrate
B
enzyme-substrate complex and substrate
C
enzyme active site and enzyme-substrate complex
D
denatured enzyme and substrate
10) Which enzyme has an optimum pH of 2?
A
trypsin
B
pepsin
C
amylase
D
lipase
11) Write DIFFUSION in your Asnwer Sheet.
A
diffusion
B
defusion
*select an answer for all questions
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