Exam (elaborations)
Edexcel A Level 2022 Biology B PAPER 2: Advanced Physiology, Evolution and Ecology
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Edexcel A Level 2022 Biology B PAPER 2: Advanced Physiology, Evolution and Ecology
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Please check the examination details below before entering your candidate information
2022 xcel B
Candidate surname Other names
Ede
Centre Number Candidate Number
Pearson Edexcel Level 3 GCE
Paper
Time 1 hour 45 minutes
reference 9BI0/02
Biology B
Advanced
PAPER 2: Advanced Physiology, Evolution and Ecology
You must have: Total Marks
Scientific calculator, HB pencil, ruler
Instructions
• Fill
Use black ink or ball-point pen.
• centrein the boxes at the top of this page with your name,
number and candidate number.
• Answer all questions.
• Answer the questions in the spaces provided
– there may be more space than you need.
• You may use a scientific calculator.
Information
• The total mark for this paper is 90.
• –Theusemarks for each question are shown in brackets
this as a guide as to how much time to spend on each question.
• toIn question(s) 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.
Advice
• Read each question carefully before you start to answer it.
• Try to answer every question.
• Check your answers if you have time at the end.
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©2022 Pearson Education Ltd.
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2022 xcel B
Answer ALL questions. Write your answers in the spaces provided.
Ede
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 DNA replication.
X
(a) Which of the following is the name of the bond labelled X on the diagram?
(1)
A ester
B glycosidic
C hydrogen
D phosphodiester
(b) Describe the roles of three named enzymes involved in DNA replication.
(3)
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2022 xcel B
(c) A section of double-stranded DNA has a total number of 10 000 nucleotides.
Ede
Adenine makes up 35% of the nucleotides in this section of
double-stranded DNA.
Calculate the total number of cytosine nucleotides found in this section of DNA.
(2)
Answer ........................................ . . . . . . . . . . . . . . . . . . . . . .
(Total for Question 1 = 6 marks)
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2022 xcel B
2 Plant growth substances and phytochromes are chemicals that affect the growth
of plants.
Ede
(a) (i) Which row of the table shows the concentrations required for the fastest
growth of lateral buds?
(1)
Auxin concentration Cytokinin concentration
A high high
B high low
C low high
D low low
(ii) Some types of auxin affect the activity of cells in the same way as hormones
such as oestrogen affect human cells.
These auxins pass through the cell membrane and affect the synthesis
of enzymes.
Explain how these auxins affect the synthesis of enzymes.
(3)
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