Exam (elaborations)
Questions and answers for biological molecules
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Handpicked high yield questions to test your knowledge of biological molecules from an A* student
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Q1.The diagram below shows the structure of molecules found in organisms.
(a) Complete the table below 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.
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
(4)
(b) 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.
Number of carbon atoms _______________
Number of hydrogen atoms _______________
Number of oxygen atoms _______________
(1)
(c) A biochemical test for reducing sugar produces a negative result with raffinose
solution.
Page 1 of 15
, Describe a biochemical test to show that raffinose solution contains a non-reducing
sugar.
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
___________________________________________________________________
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___________________________________________________________________
___________________________________________________________________
(3)
(Total 8 marks)
Q2.
(a) The table shows some substances found in cells. Complete the table to show the
properties of these substances. Put a tick in the box if the statement is correct.
Substance
Statement DNA
Starch Glycogen Deoxyribose
helicase
Substance contains only
the elements carbon,
hydrogen and oxygen
Substance is made from
amino acid monomers
Substance is found in
both animal cells and
plant cells
(4)
(b) The diagram shows two molecules of β-glucose.
On the diagram, draw a box around the atoms that are removed when the two β-
glucose molecules are joined by condensation.
(2)
Page 2 of 15
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