Exam (elaborations)
AQA AS/A Level Biology - Biological Molecules Workbook (2020-21)
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A useful workbook of past paper questions on Biological molecules, preparing students for upcoming exams.
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Biological Molecules Workbook NameWater
1. In this question, one mark is available for the quality of spelling, punctuation and grammar.
The immense biodiversity of the oceans includes:
• corals that host symbiotic algae which die if the sea temperature rises by 1°C;
• animals like polar bears that use floating ice as a base for sea fishing expeditions;
• sessile animals like mussels that feed by filtering food particles from the water and
reproduce by releasing gametes into the water;
• reef-building animals like corals that form hard calcium carbonate skeletons by extracting
mineral ions such as Ca2+ from the water;
• seaweeds of different colours which occur in shallow water;
• animals like fish that hunt prey using well-developed visual skills;
• large animals such as the blue whale;
• physically delicate organisms like jellyfish that lose their shape in air.
Using examples from the list above, describe and explain how the properties of water make it a
suitable environment for these organisms.
(Allow one lined page)
[7]
Carbohydrates
Q1.(a) Name the monosaccharides of which the following disaccharides are composed.
(i) Sucrose
monosaccharides.....................................and.......................................
(1)
(ii) Lactose
monosaccharides.....................................and.......................................
(1)
(Total 2 marks)
, Q2. Starch and cellulose are two important plant polysaccharides.
The following diagram shows part of a starch molecule and part of a cellulose molecule.
(a) Explain the difference in the structure of the starch molecule and the cellulose molecule
shown in the diagram above.
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(2)
(b) Starch molecules and cellulose molecules have different functions in plant cells. Each
molecule is adapted for its function.
Explain one way in which starch molecules are adapted for their function in plant cells.
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(2)
(c) Explain how cellulose molecules are adapted for their function in plant cells.
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(3)
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