Pearson Edexcel Level 3
GCE
Monday 15 May 2023
Pape
8BN0/01
Morning (Time: 1 hour 30 r
reference
minutes)
Biology A (Salters Nuffield)
Advanced Subsidiary
PAPER 1: Lifestyle, Transport, Genes and Health
You must have: Total Marks
Scientific calculator, HB pencil,
ruler
Instructions
•• Use black ink or ball‑point pen.
Fill in the boxes at the top of this page with your
centre number and candidate number.
•• Answer
name,
all
Show all your working out in calculations and include units where
• appropriate. – there may
Answer the questions
questions.
be spaces
in the more space than you need.
Information
• provided
The total mark for this paper is 80.
• The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each
• question. You may use a scientific calculator.
• In questions marked with an asterisk (*), marks will be awarded for your
ability to structure your answer logically, showing how the points that you
make are related or follow on from each other where appropriate.
Advice
• Read each question carefully before you start to answer it.
•• Try to answer every
Check your answers if you have time at the end.
Turn over
question.
1
, Answer ALL questions.
Write your answers in the spaces provided.
Some questions must be answered with a cross in a box . If you
change your mind about an answer, put a line through the box and
then mark your new answer with a cross .
1 The diagram shows a DNA nucleotide.
O
(a) (i) Complete the diagram to show how a complementary pair of
nucleotides would appear in a DNA molecule.
(2)
(ii) Name two bonds formed between nucleotides in the
process of DNA replication.
(2)
, 2 The human circulatory system is composed of the heart and blood vessels.
(a) The graph shows pressure changes in the aorta, left atrium and left
ventricle during the cardiac cycle.
20 Left
ventricle
15 Left atrium
R Aorta
Blood 10 Q
pressure S
/ kPa 5 P
0
–5
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
Time / s
(i) At which part of the graph is the left atrioventricular valve starting to
close? (1)
A P
B Q
C R
D S
(ii) At which part of the graph is a semilunar valve opening? (1)
A P
B Q
C R
D S
4
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