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AQA AS BIOLOGY Paper 1 QP 2021
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AQA AS BIOLOGY Paper 1 QP 2021
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AQA AS BIOLOGY Paper 1 QP 2021Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
I declare this is my own work.
AS
BIOLOGY
Paper 1
Time allowed: 1 hour 30 minutes
Materials
For this paper you must have: For Examiner’s Use
• 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.
• Do all rough work in this book. Cross through any work you do not want 9
to be marked. TOTAL
Information
• The marks for the questions are shown in brackets.
• The maximum mark for this paper is 75.
*JUN217401101*
IB/M/Jun21/E17 7401/1
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 Figure 1 shows part of a DNA molecule.
Figure 1
0 1 . 1 Name the type of bond between:
[2 marks]
complementary base pairs
adjacent nucleotides in a DNA strand
0 1 . 2 The length of a gene is described as the number of nucleotide base pairs it contains.
3
Use information in Figure 1 to calculate the length of a gene containing 4.38 ×10
base pairs.
[2 marks]
Answer nm
*02*
IB/M/Jun21/7401/1
, 3
Do not write
outside the
0 1 . 3 Describe two differences between the structure of a tRNA molecule and the box
structure of an mRNA molecule.
[2 marks]
1
2
0 1 . 4 In a eukaryotic cell, the structure of the mRNA used in translation is different from
the structure of the pre-mRNA produced by transcription.
Describe and explain a difference in the structure of these mRNA molecules.
[2 marks]
8
Turn over for the next question
Turn over ►
*03*
IB/M/Jun21/7401/1
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