Microsoft Word libs task oosci 11 5090 12 2022

2
© UCLES 2022 
5090/12/O/N/22 
1
The diagram shows cells from a plant leaf. 
Which structure contains a high concentration of magnesium? 
D
A
B
C
2
The diagram represents the cell structures of a bacterial cell, a liver cell, an onion epidermal cell 
and a red blood cell. 
X
liver cell
onion
epidermal cell
bacterial cell
red blood
cell
Which structure is represented by X? 
A 
cell membrane 
B 
cellulose cell wall 
C 
nucleus 
D 
sap vacuole 

---

3
© UCLES 2022 
5090/12/O/N/22 
[Turn over
3 
The diagram shows a typical plant cell which has been in a concentrated salt solution for 
10 minutes. 
1
2
3
Which numbered structures are partially permeable? 
A 
1 and 2 
B 
1 and 3 
C 
1 only 
D 
2 only 
4
Which process is moving nitrate ions into the cell shown? 
key
nitrate ion
A
active transport 
B
diffusion 
C
osmosis 
D
translocation 
5
Fats are broken down by the enzyme lipase to produce fatty acids and glycerol. 
According to the ‘lock and key’ model of enzyme action, what is the ‘lock’ and what is the ‘key’ in 
this reaction? 
lock 
key 
A 
fats 
lipase 
B 
lipase 
fats 
C 
fats 
fatty acids and glycerol 
D 
lipase 
fatty acids and glycerol 

---

4
© UCLES 2022 
5090/12/O/N/22