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Pearson Edexcel biology A Advanced PAPER 2 Energy, Exercise and Coordination june 2023
Pearson Edexcel biology A Advanced PAPER 2 Energy, Exercise and Coordination june 2023
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nPlease check the examination details below before entering your candidate
information
Candidate surname Other names
Centre Candidate
Number Number
Pearson Edexcel Level 3
GCE
Friday 16 June 2023
Morning (Time: 2
hours) referenc
e
9BN0/0
Biology A (Salters 2
Advanced
Nuffield)
PAPER 2: Energy, Exercise and
Coordination
You must have: Total
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ruler
Instructions
•• Use black ink or ball-point
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•• pen.
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where appropriate.
• questions.
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provided – there may be more space than
you need.
Information
•• The total mark for this paper is
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each
• 100.
question. You may use a scientific calculator.
• Into questions marked with an asterisk (*), marks will be awarded for your ability
structure your answer logically showing how the points that you make are
related or follow on from each other where appropriate.
Advic
•
e Read each question carefully before you start to answer it.
• Try
•
to answer every
Check your answers if you have time at the
Turn over
question.
end.
1
, Answer ALL questions.
Write your answers in the spaces provided.
AREA
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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 During growth, cells divide by mitosis. Many organisms also carry out
meiosis to enable sexual reproduction.
(a) (i) In which stage of cell division do spindle fibres attach to the centromeres?
(1)
A anaphase
B interphase
C metaphase
D telophase
(ii) In which stage of the cell division does the nuclear membrane
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start to break down?
(1)
A interphase
B metaphase
C prophase
D telophase
(iii) In which stage of cell division are chromatids first visible when
using a light microscope? (1)
A interphase
B metaphase
C prophase
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D telophase
2
, (b) Meiosis is involved in the production of sperm cells.
Crossing over during meiosis can result in genetic
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variation. Explain how crossing over can lead to genetic
variation.
(3)
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(Total for Question 1 = 6 marks)
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Turn
over
, 2 It has been estimated that up to 90% of the cells present in a human are
prokaryotic.
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This is due to prokaryotes being present on the skin surface and
within the human body.
(a) Which one of the following statements comparing prokaryotic DNA with
human DNA is correct? (1)
A prokaryotic DNA is linear and human DNA is circular
B prokaryotic DNA is located in a membrane-bound nucleus
C the base thymine is replaced by uracil in the prokaryotic DNA
D the sugar in both eukaryotic and prokaryotic DNA is deoxyribose
(b) The lac operon is found in some prokaryotes.
(2)
(i) Describe what is meant by the term operon.
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(ii) Describe the effect of lactose on the lac operon.
(3)
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(Total for Question 2 = 6 marks)
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