Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signatuure
I declare this is my own work.
AS
BIOLOGY
Paper 2
Afternoon Time allowed: 1 hour and 30 minutes
Materials
For Examiner’s Use
For this paper you must have:
• a ruler with millimetre measurements Question Mark
• a scientific calculator.
1
Instructions 2
• Use black ink or black ball-point pen. 3
• Fill in the boxes at the top of this page. 4
• Answer all questions.
5
• You must answer the questions in the spaces provided. Do not write
outside the box around each page or on blank pages. 6
• If you need extra space for your answer(s), use the lined pages at the end of 7
this book. Write the question number against your answer(s). 8
• Show all your working.
9
• Do all rough work in this book. Cross through any work you do not want
to be marked. TOTAL
Information
• The marks for the questions are shown in brackets.
• The maximum mark for this paper is 75.
for more papers: tyrionpapers.com
7401/2
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 Figure 1 shows part of a DNA molecule during replication in a eukaryotic cell.
Figure 1
0 1 . 1 An enzyme has caused the DNA double helix to unwind, allowing new strands
to be synthesised.
Name the enzyme responsible for separating the two DNA strands.
[1mark]
for more papers: tyrionpapers.com
, Do not write
outside the
box
0 1 . 2 Describe how a new polynucleotide strand is formed on one of the original DNA
strands.
[3 marks]
0 1 . 3 DNA replication is described as semi-conservative.
Explain the meaning of the term semi-conservative in relation to DNA replication.
[2 marks]
0 1 . 4 A short section of one original DNA strand has the base sequence:
CTAGGCA
Determine the base sequence of the newly synthesised strand.
[1 mark]
for more papers: tyrionpapers.com
Centre number Candidate number
Surname
Forename(s)
Candidate signatuure
I declare this is my own work.
AS
BIOLOGY
Paper 2
Afternoon Time allowed: 1 hour and 30 minutes
Materials
For Examiner’s Use
For this paper you must have:
• a ruler with millimetre measurements Question Mark
• a scientific calculator.
1
Instructions 2
• Use black ink or black ball-point pen. 3
• Fill in the boxes at the top of this page. 4
• Answer all questions.
5
• You must answer the questions in the spaces provided. Do not write
outside the box around each page or on blank pages. 6
• If you need extra space for your answer(s), use the lined pages at the end of 7
this book. Write the question number against your answer(s). 8
• Show all your working.
9
• Do all rough work in this book. Cross through any work you do not want
to be marked. TOTAL
Information
• The marks for the questions are shown in brackets.
• The maximum mark for this paper is 75.
for more papers: tyrionpapers.com
7401/2
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 Figure 1 shows part of a DNA molecule during replication in a eukaryotic cell.
Figure 1
0 1 . 1 An enzyme has caused the DNA double helix to unwind, allowing new strands
to be synthesised.
Name the enzyme responsible for separating the two DNA strands.
[1mark]
for more papers: tyrionpapers.com
, Do not write
outside the
box
0 1 . 2 Describe how a new polynucleotide strand is formed on one of the original DNA
strands.
[3 marks]
0 1 . 3 DNA replication is described as semi-conservative.
Explain the meaning of the term semi-conservative in relation to DNA replication.
[2 marks]
0 1 . 4 A short section of one original DNA strand has the base sequence:
CTAGGCA
Determine the base sequence of the newly synthesised strand.
[1 mark]
for more papers: tyrionpapers.com
