May/June 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

0/40 marks
0Correct0Partial0Wrong40Unattempted
Filters0 active

Questions

Select a part to jump to its question

Finish set
Q1
1
–/1 mk
Q2
2
–/1 mk
Q3
3
–/1 mk
Q4
4
–/1 mk
Q5
5
–/1 mk
Q6
6
–/1 mk
Q7
7
–/1 mk
Q8
8
–/1 mk
Q9
9
–/1 mk
Q10
10
–/1 mk
Q11
11
–/1 mk
Q12
12
–/1 mk
Q13
13
–/1 mk
Q14
14
–/1 mk
Q15
15
–/1 mk
Q16
16
–/1 mk
Q17
17
–/1 mk
Q18
18
–/1 mk
Q19
19
–/1 mk
Q20
20
–/1 mk
Q21
21
–/1 mk
Q22
22
–/1 mk
Q23
23
–/1 mk
Q24
24
–/1 mk
Q25
25
–/1 mk
Q26
26
–/1 mk
Q27
27
–/1 mk
Q28
28
–/1 mk
Q29
29
–/1 mk
Q30
30
–/1 mk
Q31
31
–/1 mk
Q32
32
–/1 mk
Q33
33
–/1 mk
Q34
34
–/1 mk
Q35
35
–/1 mk
Q36
36
–/1 mk
Q37
37
–/1 mk
Q38
38
–/1 mk
Q39
39
–/1 mk
Q40
40
–/1 mk
33Blood Clotting Oxygen TransportMedium1 mark
The diagram shows the pathway for the transport of carbon dioxide that occurs in red blood cells.
Figure 33, a flow diagram for the transport of carbon dioxide in a red blood cell: CO$_2$ and H$_2$O both feed by curved arrows into box 1; box 1 points to box 2; box 2 points to both box 3 and box 4; haemoglobin feeds by a curved arrow into box 3; box 3 points down and out of the diagram.
Which row is correct?
1234
Acarbonic anhydrasecarbonic acidhydrogen ionshydrogencarbonate ions
Bcarbaminohaemoglobinhaemoglobinic acidhydrogen ionshydrogencarbonate ions
Ccarbaminohaemoglobincarbonic anhydrasecarbonic acidcarbon dioxide
Dhaemoglobinic acidcarbonic acidhydrogencarbonate ionshydrogen ions