Test in Ten: Biological Molecules

Three properties of water are listed:

• Water cools a surface from which it evaporates.
• Water is used as a solvent for many chemicals.
• Water is involved in many metabolic reactions.

Which of these properties make water suitable to use in a blood transport system?

• 1 and 2 only

• 1 and 3 only

• 2 only

• 3 only

In the human body, large molecules are synthesized from small molecules.

Which row is correct for the small molecules required for synthesis of glycogen, lipids and proteins?

• A

• B

• C

• D

Which elements are present in all fats?

• carbon

• hydrogen

• oxygen

• nitrogen

Which chemical element forms part of all protein molecules?

• calcium

• iron

• magnesium

• nitrogen

A food gives the following results on testing:

• purple colour in the biuret test
• blue colour when heated with Benedict's solution
• yellow colour with iodine
• white emulsion with ethanol

Which nutrients does the food contain?

• fat and protein

• protein and reducing sugar

• reducing sugar and starch

• starch and fat