Please write clearly in block capitals.
Centre number Candidate number
Surname
Forename(s)
Candidate signature
.
AS
BIOLOGY
Paper 1
Tuesday 19 May 2020 Afternoon Time allowed: 1 hour 30 minutes
Materials
For this paper you must have:
For Examiner’s Use
a ruler with millimetre measurements
a scientific calculator. Question Mark
1
Instructions
Use black ink or black ball-point pen. 2
Fill in the boxes at the top of this page. 3
Answer all questions. 4
You must answer the questions in the spaces provided. Do not write
5
outside the box around each page or on blank pages.
If you need extra space for your answer(s), use the lined pages at the end of 6
this book. Write the question number against your answer(s). 7
Show all your working. 8
Do all rough work in this book. Cross through any work you do not want
to be marked. 9
TOTAL
Information
The marks for the questions are shown in brackets.
The maximum mark for this paper is 75.
*JUN207401101*
IB/M/Jun20/E12 7401/1
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 Figure 1 shows the structure of molecules found in organisms.
Figure 1
0 1 . 1 Complete Table 1 by putting the correct letter, A, B, C or D, in the box next to each
statement. Each letter may be used once, more than once, or not at all.
[4 marks]
Table 1
Letter Statement
is a monomer in an enzyme’s
active site
is a monomer in cellulose
is produced during
photosynthesis and respiration
forms a polymer that gives a
positive result with a biuret test
*02*
IB/M/Jun20/7401/1
, 3
Do not write
outside the
box
0 1 . 2 Raffinose is a trisaccharide of three monosaccharides: galactose, glucose and
fructose. The chemical formulae of these monosaccharides are:
galactose = C6H12O6
glucose = C6H12O6
fructose = C6H12O6
Give the number of carbon atoms, hydrogen atoms and oxygen atoms in a molecule
of raffinose.
[1 mark]
Number of carbon atoms
Number of hydrogen atoms
Number of oxygen atoms
0 1 . 3 A biochemical test for reducing sugar produces a negative result with raffinose
solution.
Describe a biochemical test to show that raffinose solution contains a non-reducing
sugar.
[3 marks]
8
Turn over ►
*03*
IB/M/Jun20/7401/1
, 4
Do not write
outside the
box
0 2 . 1 Explain the arrangement of phospholipids in a cell-surface membrane.
[2 marks]
0 2 . 2 Describe how an ester bond is formed in a phospholipid molecule.
[2 marks]
0 2 . 3 State and explain the property of water that helps to prevent temperature increase in a
cell.
[2 marks]
Property
Explanation
6
*04*
IB/M/Jun20/7401/1
Centre number Candidate number
Surname
Forename(s)
Candidate signature
.
AS
BIOLOGY
Paper 1
Tuesday 19 May 2020 Afternoon Time allowed: 1 hour 30 minutes
Materials
For this paper you must have:
For Examiner’s Use
a ruler with millimetre measurements
a scientific calculator. Question Mark
1
Instructions
Use black ink or black ball-point pen. 2
Fill in the boxes at the top of this page. 3
Answer all questions. 4
You must answer the questions in the spaces provided. Do not write
5
outside the box around each page or on blank pages.
If you need extra space for your answer(s), use the lined pages at the end of 6
this book. Write the question number against your answer(s). 7
Show all your working. 8
Do all rough work in this book. Cross through any work you do not want
to be marked. 9
TOTAL
Information
The marks for the questions are shown in brackets.
The maximum mark for this paper is 75.
*JUN207401101*
IB/M/Jun20/E12 7401/1
, 2
Do not write
outside the
Answer all questions in the spaces provided. box
0 1 Figure 1 shows the structure of molecules found in organisms.
Figure 1
0 1 . 1 Complete Table 1 by putting the correct letter, A, B, C or D, in the box next to each
statement. Each letter may be used once, more than once, or not at all.
[4 marks]
Table 1
Letter Statement
is a monomer in an enzyme’s
active site
is a monomer in cellulose
is produced during
photosynthesis and respiration
forms a polymer that gives a
positive result with a biuret test
*02*
IB/M/Jun20/7401/1
, 3
Do not write
outside the
box
0 1 . 2 Raffinose is a trisaccharide of three monosaccharides: galactose, glucose and
fructose. The chemical formulae of these monosaccharides are:
galactose = C6H12O6
glucose = C6H12O6
fructose = C6H12O6
Give the number of carbon atoms, hydrogen atoms and oxygen atoms in a molecule
of raffinose.
[1 mark]
Number of carbon atoms
Number of hydrogen atoms
Number of oxygen atoms
0 1 . 3 A biochemical test for reducing sugar produces a negative result with raffinose
solution.
Describe a biochemical test to show that raffinose solution contains a non-reducing
sugar.
[3 marks]
8
Turn over ►
*03*
IB/M/Jun20/7401/1
, 4
Do not write
outside the
box
0 2 . 1 Explain the arrangement of phospholipids in a cell-surface membrane.
[2 marks]
0 2 . 2 Describe how an ester bond is formed in a phospholipid molecule.
[2 marks]
0 2 . 3 State and explain the property of water that helps to prevent temperature increase in a
cell.
[2 marks]
Property
Explanation
6
*04*
IB/M/Jun20/7401/1
