Oxford Cambridge and RSA
AS-Level OCR 2025 Biology A
Paper 1
Monday 12 May 2025 – Morning
AS Level Biology A
H020/01 Breadth in biology
Time allowed: 1 hour 30 minutes
OCR is an exempt Charity
Turn over
, 2
Section A
You should spend a maximum of 25 minutes on this section.
Write your answer for each question in the box provided.
1 Which statement correctly describes microscopes?
A Light microscopes can produce higher resolution images than electron microscopes.
B Scanning electron microscopes produce higher resolution images than transmission electron
microscopes.
C Transmission electron microscopes can achieve higher magnifications than scanning
electron microscopes.
D Transmission electron microscopes can be used to view living tissues.
Your answer [1]
2 Which statement correctly describes phosphorylated nucleotides?
A ADP can be hydrolysed to produce ATP.
B ADP can be phosphorylated to produce ATP.
C All phosphorylated nucleotides have three phosphate groups.
D Energy is released when ATP undergoes a condensation reaction to form ADP and Pi.
Your answer [1]
3 Which type of stem cell can become specialised into more than one cell type but is limited to a
range of cell types?
A Embryonic
B Multipotent
C Pluripotent
D Totipotent
Your answer [1]
© OCR 2025
, 3
4 A student carries out a non-reducing sugar test on a sample of fruit juice.
What is the correct reason for heating the sample with hydrochloric acid?
A It breaks the ester bond between glucose and fructose
B It breaks the ester bond between glucose and sucrose
C It breaks the glycosidic bond between glucose and fructose
D It breaks the glycosidic bond between glucose and sucrose
Your answer [1]
© OCR 2025 Turn over
AS-Level OCR 2025 Biology A
Paper 1
Monday 12 May 2025 – Morning
AS Level Biology A
H020/01 Breadth in biology
Time allowed: 1 hour 30 minutes
OCR is an exempt Charity
Turn over
, 2
Section A
You should spend a maximum of 25 minutes on this section.
Write your answer for each question in the box provided.
1 Which statement correctly describes microscopes?
A Light microscopes can produce higher resolution images than electron microscopes.
B Scanning electron microscopes produce higher resolution images than transmission electron
microscopes.
C Transmission electron microscopes can achieve higher magnifications than scanning
electron microscopes.
D Transmission electron microscopes can be used to view living tissues.
Your answer [1]
2 Which statement correctly describes phosphorylated nucleotides?
A ADP can be hydrolysed to produce ATP.
B ADP can be phosphorylated to produce ATP.
C All phosphorylated nucleotides have three phosphate groups.
D Energy is released when ATP undergoes a condensation reaction to form ADP and Pi.
Your answer [1]
3 Which type of stem cell can become specialised into more than one cell type but is limited to a
range of cell types?
A Embryonic
B Multipotent
C Pluripotent
D Totipotent
Your answer [1]
© OCR 2025
, 3
4 A student carries out a non-reducing sugar test on a sample of fruit juice.
What is the correct reason for heating the sample with hydrochloric acid?
A It breaks the ester bond between glucose and fructose
B It breaks the ester bond between glucose and sucrose
C It breaks the glycosidic bond between glucose and fructose
D It breaks the glycosidic bond between glucose and sucrose
Your answer [1]
© OCR 2025 Turn over
