Friday 12 June 2026 – Morning
A Level Biology A
H420/02 Biological diversity
Time allowed: 2 hours 15 minutes
You can use:
*
• a scientific or graphical calculator
• a ruler (cm/mm)
* H 4 2 0 0 2 *
*
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined page at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 100.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 28 pages.
ADVICE
• Read each question carefully before you start your answer.
Cambridge OCR 2026 [601/4260/1] Cambridge OCR is an exempt Charity
DC (SL/TC) 359141/5 Turn over
, 2
Section A
You should spend a maximum of 20 minutes on this section.
Write your answer to each question in the box provided.
1 Which class of biomolecules does this molecule belong to?
H
H O
N C C
H O H
H
A Amino acids
B Monosaccharides
C Nucleic acids
D Purines
Your answer [1]
2 Which bond forms a polymer from monomers by a condensation reaction?
A Disulfide bond between two cysteines in a polypeptide
B Ester bond between a glycerol and a fatty acid
C Hydrogen bond between two water molecules
D Peptide bond between two adjacent amino acids in a polypeptide
Your answer [1]
Cambridge OCR 2026
, 3
3 This is a diagram of an α-glucose molecule.
CH2OH
O
H H
H
OH H
OH OH
H OH
Which of the following parts of the molecule allow(s) α-glucose to form the glycosidic bonds in a
glycogen molecule?
1. H
H
H
OH
OH
OH
CH
CH OH
2. CH222OH
OH
H
H
H
H
H
3. H
OH
OH
OH
A 1, 2 and 3
B Only 1 and 2
C Only 2 and 3
D Only 1
Your answer [1]
Cambridge OCR 2026 Turn over
A Level Biology A
H420/02 Biological diversity
Time allowed: 2 hours 15 minutes
You can use:
*
• a scientific or graphical calculator
• a ruler (cm/mm)
* H 4 2 0 0 2 *
*
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined page at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 100.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 28 pages.
ADVICE
• Read each question carefully before you start your answer.
Cambridge OCR 2026 [601/4260/1] Cambridge OCR is an exempt Charity
DC (SL/TC) 359141/5 Turn over
, 2
Section A
You should spend a maximum of 20 minutes on this section.
Write your answer to each question in the box provided.
1 Which class of biomolecules does this molecule belong to?
H
H O
N C C
H O H
H
A Amino acids
B Monosaccharides
C Nucleic acids
D Purines
Your answer [1]
2 Which bond forms a polymer from monomers by a condensation reaction?
A Disulfide bond between two cysteines in a polypeptide
B Ester bond between a glycerol and a fatty acid
C Hydrogen bond between two water molecules
D Peptide bond between two adjacent amino acids in a polypeptide
Your answer [1]
Cambridge OCR 2026
, 3
3 This is a diagram of an α-glucose molecule.
CH2OH
O
H H
H
OH H
OH OH
H OH
Which of the following parts of the molecule allow(s) α-glucose to form the glycosidic bonds in a
glycogen molecule?
1. H
H
H
OH
OH
OH
CH
CH OH
2. CH222OH
OH
H
H
H
H
H
3. H
OH
OH
OH
A 1, 2 and 3
B Only 1 and 2
C Only 2 and 3
D Only 1
Your answer [1]
Cambridge OCR 2026 Turn over
