Quiz 1 (MCQ): Topic 1- Molecules of Life

The partially negative charge at one end of one water molecule is attracted to the partially positive charge of another water molecule. What is this attraction called?

• a covalent bond.

• a hydrogen bond.

• an ionic bond.

• a hydrophilic bond.

Water is a versatile solvent due to its

• low viscosity.

• polar molecules.

• high specific heat.

• high boiling point.

At what temperature is water at its densest?

• 0°C

• 4°C

• 36°C

• 100°C

Water carries out all the following functions of life, EXCEPT that it does NOT act as a

• lubricant.

• cooling agent.

• source of carbon.

• chemical reagent.

Which of the following characteristics of water are essential for the proper functioning of tissue fluid?

I. Water has low viscosity

II. Water has high surface tension

III. Water has maximum density at 4ºC

• I only

• I and II

• II and III

• I, II and III

Polymers of polysaccharides, proteins and nucleic acid are all synthesised from monomers by

• hydration.

• condensation.

• carboxylation.

• hydrolysis

Which of the following carbohydrate will yield two molecules of glucose upon hydrolysis?

• fructose.

• galactose.

• maltose.

• ribose.

Glucose and fructose are

• isomers

• hexose sugars

• the building blocks of complex carbohydrates

• all of the above

Monosaccharides are water soluble because:

• they contain a large number of methyl groups.

• they have a large number of polar hydroxyl groups.

• they have at least one double bond between adjacent carbons.

• they have large numbers of nonpolar carbons in their backbones.

Which of the following is TRUE of both starch and cellulose?

• they are both polymers of glucose.

• they are both used for storing energy in plants.

• they are both used for structure in plant cells.

• they both make up a considerable part of the plasma membrane.