REVISION 2 (56 Marks)
IB Standard level Biology Dulwich College Shanghai
Topic 3: Chemistry of Life
Chemical elements and water
State that the most frequently occurring chemical elements in living things are carbon, hydrogen, oxygen and nitrogen. 3.1.2
State that a variety of other elements are needed by living organisms, including sulphur, calcium, phosphorus, iron and sodium. 3.1.3
State one role for each of the elements in 3.1.2.
Draw and label a diagram showing the structure of water molecules to show their polarity and hydrogen bond formation. 3.1.5
Outline the thermal, cohesive and solvent properties of water. 3.1.6
Explain the relationship between the properties of water and its uses in living organisms as a coolant, medium for metabolic reactions and transport medium.
Carbohydrates, Lipids and Proteins
Distinguish between organic and inorganic compounds.
Identify amino acids, glucose, ribose and fatty acids from diagrams showing their structure. 3.2.3
List three examples of each of monosaccharides, disaccharides and polysaccharides. 3.2.4
State one function of glucose, lactose and glycogen in animals and of fructose, sucrose and cellulose in plants. 3.2.5
Outline the role of condensation and hydrolysis in the relationships between monosaccharides, disaccharides and polysaccharides; between fatty acids, glycerol and triglycerides; and between amino acids and polypeptides. 3.2.6
State three functions of lipids
Compare the use of carbohydrates and lipids in energy storage.
Multiple Choice (7 Marks)
Which is not a primary function of protein molecules?
Which of the following could be a function of a membrane protein? A.
What is the maximum number of fatty acids that can be condensed with glycerol? A.
What is a role of carbohydrates in animal cells?
As channels for passive transport
As energy storage
As components of the animal cell wall
Which of the following terms correctly describe the molecule below?
I and III only
II and III only
I, II and III
What causes water to have a relatively high boiling point? A.
Hydrogen bonds between water molecules
Hydrogen bonds between hydrogen and oxygen within water molecules C.
Cohesion between water molecules and the container in which the water is boiled D.
Covalent bonds between hydrogen and oxygen within water molecules
Identify the atoms and ions from the table below.
Data Analysis (7 marks)
Scientists have long been concerned about the effect of heavy metals in foods that we eat. Aquatic filter feeders including bivalves, such as mussels and oysters, are especially prone to accumulation of heavy metals. Calcium is taken into bivalves through protein channels, but other non-essential elements may also be taken in. To investigate the relationship between the uptake of calcium and other elements, the bivalves Hyridella depressa and Velesunio ambiguous were placed in solutions containing ten times the normal level of calcium (Ca). The elements manganese (Mn), lead (Pb), cadmium (Cd) and cobalt (Co) were also present in the solutions at normal concentrations. The results are shown below.
[Source: Reprinted from Markich Scott J. and Jeffree Ross A., “Absorption of divalent trace metals as analogues of calcium by Australian freshwater bivalves: an explanation of how water hardness reduces metal toxicity”, Aquatic Toxicology (August 1994), vol. 29, issue 3–4, pp. 257–290, © 1994 with permission from Elsevier]
Outline the effect of increasing calcium levels in the water...
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