IB SL Topic 2: Molecular biology (2.3 Carbohydate and lipid

0. The Framingham heart study was an observational study that went on for 20 years. The following data were produced. Which conclusion can be drawn, based on these data?

• It is better to eat margarine than to eat butter.

• The more margarine consumed, the greater the incidence of coronary heart disease.

• Butter is a natural product whereas margarine is hydrogenated vegetable oil that leads to coronary heart disease.

• Margarine causes more heart related deaths than butter.

0. The diagram shows a molecular structure.

Which type of molecule is shown?

• Amino acid

• Lipid

• Carbohydrate

• Nucleotide

0. Which type of reaction is the breakdown of starch into sugars?

• Denaturation

• Reduction

• Catabolic

• Condensation

2. Which molecule is a polysaccharide?

• Cellulose

• Fructose

• Maltose

• Sucrose

1. Which always contains carbon, hydrogen and oxygen?

I. Carbohydrate

II. Protein

III. Fat

• I and II only

• I and III only

• II and III only

• I, II and III

1. What are these molecules?

• A

• B

• C

• D

0. Which are functions of lipids?

• Hydrophilic solvent and energy storage

• Hydrophobic solvent and membrane potential

• Thermal insulation and energy storage

• Thermal insulation and hydrophilic solvent

1. What process occurs when fatty acids combine with glycerol to make a triglyceride?

• Condensation

• Decarboxylation

• Denaturation

• Hydrolysis

2. What is the difference between galactose and lactose?

• Lactose is a disaccharide and galactose is a monosaccharide.

• Lactose is the product of anaerobic respiration in humans and galactose is the product of anaerobic respiration in yeast.

• Lactose is an enzyme and galactose is a hormone.

• Galactose is a sugar found in milk but lactose is not found in milk.

2. The diagrams show three representations of the structure of the same chemical substance. What chemical substance is shown?

• Ribose

• Glucose

• Fatty acid

• Amino acid