Oxford Cambridge and RSA
AS Level Biology A
H020/01 Breadth in biology
Time allowed: 1 hour 30 minutes
You can use:
a scientific or graphical calculator
a ruler (cm/mm)
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 pages 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 acorrect method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• This document has 26 pages.
ADVICE
• Read each question carefully before you start your answer.
OCR is an exempt Charity
Turn over
, 2
Section A
You should spend a maximum of 25 minutes on this section.
Write your answer to each question in the box provided.
1 Which row correctly describes the muscles involved in forced expiration in
mammals?
Internal External Abdominal Diaphragm
intercostals intercostals muscles
A Contract Relax Contract Relaxes
B Relax Contract Relax Contracts
C Contract Relax Relax Relaxes
D Relax Relax Contract Contracts
Your answer [1]
2 Which comparison between starch and cellulose is correct?
Starch Cellulose
A Contains α-glucose only Contains β-glucose only
B Contains 1,6-glycosidic bonds Contains 1,4-glycosidic bonds
only only
C Branched structure Unbranched structure
D Soluble in water Soluble in water
Your answer [1]
, 3
3 A triglyceride molecule contains three identical fatty acid chains, each with the
formula C₁₆H₃₁COOH.
How many water molecules are released when this triglyceride is formed from
glycerol and the three fatty acids?
A 1
B 2
C 3
D 4
Your answer [1]
4 The enzyme amylase requires a chloride ion (Cl⁻) for the formation of a correctly
shaped active site.
What term best describes the chloride ion in this context?
A Coenzyme
B Prosthetic group
C Inorganic cofactor
D Apoenzyme
Your answer [1]
AS Level Biology A
H020/01 Breadth in biology
Time allowed: 1 hour 30 minutes
You can use:
a scientific or graphical calculator
a ruler (cm/mm)
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 pages 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 acorrect method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 70.
• The marks for each question are shown in brackets [ ].
• This document has 26 pages.
ADVICE
• Read each question carefully before you start your answer.
OCR is an exempt Charity
Turn over
, 2
Section A
You should spend a maximum of 25 minutes on this section.
Write your answer to each question in the box provided.
1 Which row correctly describes the muscles involved in forced expiration in
mammals?
Internal External Abdominal Diaphragm
intercostals intercostals muscles
A Contract Relax Contract Relaxes
B Relax Contract Relax Contracts
C Contract Relax Relax Relaxes
D Relax Relax Contract Contracts
Your answer [1]
2 Which comparison between starch and cellulose is correct?
Starch Cellulose
A Contains α-glucose only Contains β-glucose only
B Contains 1,6-glycosidic bonds Contains 1,4-glycosidic bonds
only only
C Branched structure Unbranched structure
D Soluble in water Soluble in water
Your answer [1]
, 3
3 A triglyceride molecule contains three identical fatty acid chains, each with the
formula C₁₆H₃₁COOH.
How many water molecules are released when this triglyceride is formed from
glycerol and the three fatty acids?
A 1
B 2
C 3
D 4
Your answer [1]
4 The enzyme amylase requires a chloride ion (Cl⁻) for the formation of a correctly
shaped active site.
What term best describes the chloride ion in this context?
A Coenzyme
B Prosthetic group
C Inorganic cofactor
D Apoenzyme
Your answer [1]
