Oxford Cambridge and RSA
AS Level Biology A
H020/02 Depth 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 [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 25 pages.
ADVICE
• Read each question carefully before you start your answer.
OCR is an exempt Charity
Turn over
,1 (a) Triglycerides are an important biological molecule.
(i) The table below shows data from five patients with different diets, measuring the ratio of
saturated to unsaturated fatty acids in their triglycerides and their blood cholesterol
levels (mmol/L).
Patient Ratio of saturated to unsaturated Blood cholesterol level
fatty acids (mmol/L)
A 1:4 3.8
B 1:3 4.2
C 1:2 4.9
D 1:1 5.7
E 2:1 6.4
Based only on the data in the table, suggest a hypothesis about the relationship between
saturated fat intake and blood cholesterol level.
...........................................................................................................................................
...................................................................................................................................... [1]
, (ii) Students investigated the frequency of high cholesterol in males and females of the
same age group.
The table shows their findings.
Observed frequency of people Expected frequency of people with high
Group with high cholesterol (O) cholesterol (E)
Females 423 460
Males 512 475
Calculate chi-squared for this data.
Use the formula: χ² = Σ(O − E)²/E
Give your answer to 4 significant figures.
χ² = ................................................[3]
AS Level Biology A
H020/02 Depth 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 [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 25 pages.
ADVICE
• Read each question carefully before you start your answer.
OCR is an exempt Charity
Turn over
,1 (a) Triglycerides are an important biological molecule.
(i) The table below shows data from five patients with different diets, measuring the ratio of
saturated to unsaturated fatty acids in their triglycerides and their blood cholesterol
levels (mmol/L).
Patient Ratio of saturated to unsaturated Blood cholesterol level
fatty acids (mmol/L)
A 1:4 3.8
B 1:3 4.2
C 1:2 4.9
D 1:1 5.7
E 2:1 6.4
Based only on the data in the table, suggest a hypothesis about the relationship between
saturated fat intake and blood cholesterol level.
...........................................................................................................................................
...................................................................................................................................... [1]
, (ii) Students investigated the frequency of high cholesterol in males and females of the
same age group.
The table shows their findings.
Observed frequency of people Expected frequency of people with high
Group with high cholesterol (O) cholesterol (E)
Females 423 460
Males 512 475
Calculate chi-squared for this data.
Use the formula: χ² = Σ(O − E)²/E
Give your answer to 4 significant figures.
χ² = ................................................[3]
