Exam (elaborations)
Edexcel AS Level 2022 Biology B PAPER 1: Core Cellular Biology and Microbiology
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Edexcel AS Level 2022 Biology B PAPER 1: Core Cellular Biology and Microbiology
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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 30 minutes
reference 8BI0/01
Biology B
Advanced Subsidiary
PAPER 1: Core Cellular Biology and Microbiology
You must have: Total Marks
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.
Information
• 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.
• structure
In questions marked with an asterisk (*), marks will be awarded for your ability to
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.
Turn over
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©2022 Pearson Education Ltd.
Q:1/1/1/1/1/1/1/
, gy
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2022 xcel B
Answer ALL questions.
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 A student drew two types of white blood cell, from a slide viewed using a
light microscope.
X Y
Cell A Cell B
The student used the internet to research the actual diameter of these two types
of cell.
The student found several values for the diameters of cell A and cell B. They used the
mean value for the diameter of cell B to calculate the magnification of the drawing
of cell B.
The student calculated the magnification of the drawing of cell B to be × 1571.
The student found the following values for the diameter of cell A:
0.016 mm, 0.022 mm, 0.019 mm, 0.021 mm, 0.017 mm.
(a) Calculate the magnification of the drawing of cell A, using the mean diameter of
this cell.
Measure the diameter of cell A between the points X and Y on the diagram.
(2)
Answer ......................... ............... . . . . . . . . . . . . . . . . . . . . . .
2
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, gy
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2022 xcel B
(b) This method of calculating the magnification of these drawings is not accurate.
Ede
Describe a method that the student could use to calculate the
magnification accurately.
(3)
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(Total for Question 1 = 5 marks)
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3
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2022 xcel B
2 Triglycerides, found in living organisms, have different melting points.
Ede
Two factors that affect the melting point of a triglyceride are:
1. the length of the fatty acid chains
2. whether the fatty acid chains are saturated or unsaturated.
(a) A triglyceride is made from the components glycerol and fatty acids.
(i) How many of the following statements about triglycerides are correct?
(1)
• a glycerol molecule is joined to each fatty acid by an ester bond
• an unsaturated fatty acid has at least one double bond between two
carbon atoms
• all triglycerides have three fatty acids joined to a glycerol
A none
B one
C two
D three
(ii) The table shows the relative atomic mass of the elements present in
a triglyceride.
Element Relative atomic mass
carbon 12
hydrogen 1
oxygen 16
How much lower is the molecular mass of this triglyceride molecule, after
it has been made from its components, compared with the sum of its
component molecules?
(1)
A 18
B 33
C 54
D 99
4
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