AcePapers
AS Level Biology B (Edexcel specification 8BI0)
Paper 1: Core Cellular Biology and
Microbiology
Practice question paper
Practice for 8BI0 Paper 1
Time allowed 1 hour 30 minutes
Total marks 80
Equipment Calculator, ruler, HB pencil
Before you start
• Write in black ink. A pencil may be used for graphs and drawings.
• Attempt every question and write each answer in the space below it; you may not need
all of the space.
• The number of marks for each part is given in brackets. Use it to judge how much to
write and how long to spend.
• Questions labelled with an asterisk (*) also reward a clear, logically sequenced answer in
which your points are connected.
• Show your working in calculations and give units where they are needed.
• Leave time at the end to read through your answers.
Written by AcePapers
Independent practice paper written for revision. Not an official Pearson paper
and not affiliated with or endorsed by Pearson.
AcePapers · 8BI0 Paper 1 · independent practice material Page 1
, Answer every question. Where a multiple-choice question has boxes, mark your chosen answer with a
cross. To change it, draw a line through the cross and mark the new box.
1 Carbohydrates are used for energy storage and for structural support in living
organisms.
(a) Which row correctly describes amylopectin? (1)
A α-glucose monomers; 1,4 glycosidic bonds only; unbranched
B α-glucose monomers; 1,4 and 1,6 glycosidic bonds; branched
C β-glucose monomers; 1,4 glycosidic bonds only; unbranched
D β-glucose monomers; 1,4 and 1,6 glycosidic bonds; branched
(Put a cross in one box.)
(b) Describe how a glycosidic bond forms between two monosaccharides. (2)
(c) Glycogen is the main storage carbohydrate in mammals. Explain how two
features of glycogen make it suitable for this role. (4)
(d) A student said that cellulose cannot be digested by humans because it
contains the wrong type of glucose. Explain why the student is partly
correct. (1)
[Question 1: 8 marks]
AcePapers · 8BI0 Paper 1 · independent practice material Page 2
, 2 Enzymes are globular proteins that catalyse metabolic reactions.
(a) Explain why a change in one amino acid in the primary structure of an
enzyme can stop the enzyme working. (3)
(b)(i) The graph shows the initial rate of an enzyme-catalysed reaction at
different substrate concentrations, with and without compound X.
Calculate the percentage decrease in initial rate caused by
compound X at a substrate concentration of 10 mmol dm−3. (2)
= ................................................ %
(ii) Use the graph to deduce whether compound X is a competitive or a
non-competitive inhibitor. Give a reason for your answer. (2)
AcePapers · 8BI0 Paper 1 · independent practice material Page 3
AS Level Biology B (Edexcel specification 8BI0)
Paper 1: Core Cellular Biology and
Microbiology
Practice question paper
Practice for 8BI0 Paper 1
Time allowed 1 hour 30 minutes
Total marks 80
Equipment Calculator, ruler, HB pencil
Before you start
• Write in black ink. A pencil may be used for graphs and drawings.
• Attempt every question and write each answer in the space below it; you may not need
all of the space.
• The number of marks for each part is given in brackets. Use it to judge how much to
write and how long to spend.
• Questions labelled with an asterisk (*) also reward a clear, logically sequenced answer in
which your points are connected.
• Show your working in calculations and give units where they are needed.
• Leave time at the end to read through your answers.
Written by AcePapers
Independent practice paper written for revision. Not an official Pearson paper
and not affiliated with or endorsed by Pearson.
AcePapers · 8BI0 Paper 1 · independent practice material Page 1
, Answer every question. Where a multiple-choice question has boxes, mark your chosen answer with a
cross. To change it, draw a line through the cross and mark the new box.
1 Carbohydrates are used for energy storage and for structural support in living
organisms.
(a) Which row correctly describes amylopectin? (1)
A α-glucose monomers; 1,4 glycosidic bonds only; unbranched
B α-glucose monomers; 1,4 and 1,6 glycosidic bonds; branched
C β-glucose monomers; 1,4 glycosidic bonds only; unbranched
D β-glucose monomers; 1,4 and 1,6 glycosidic bonds; branched
(Put a cross in one box.)
(b) Describe how a glycosidic bond forms between two monosaccharides. (2)
(c) Glycogen is the main storage carbohydrate in mammals. Explain how two
features of glycogen make it suitable for this role. (4)
(d) A student said that cellulose cannot be digested by humans because it
contains the wrong type of glucose. Explain why the student is partly
correct. (1)
[Question 1: 8 marks]
AcePapers · 8BI0 Paper 1 · independent practice material Page 2
, 2 Enzymes are globular proteins that catalyse metabolic reactions.
(a) Explain why a change in one amino acid in the primary structure of an
enzyme can stop the enzyme working. (3)
(b)(i) The graph shows the initial rate of an enzyme-catalysed reaction at
different substrate concentrations, with and without compound X.
Calculate the percentage decrease in initial rate caused by
compound X at a substrate concentration of 10 mmol dm−3. (2)
= ................................................ %
(ii) Use the graph to deduce whether compound X is a competitive or a
non-competitive inhibitor. Give a reason for your answer. (2)
AcePapers · 8BI0 Paper 1 · independent practice material Page 3
