TUTORIAL: MOLECULES OF LIFE

1. Which statement is NOT a property of water?

• It is a monopolar molecule

• Water is a universal solvent due to its polarity

• Water has high specific heat capacity

• Water has a high surface tension

Which of the following statement is TRUE about carbohydrates?

• All monosaccharides soluble in water.

• Sucrose and lactose are example of polysaccharides.

• Polysaccharides functions as long-term energy storage

  molecules.

• A disaccharide contains two monosaccharides that are joined through hydrolysis reaction.

Which of the following is the storage carbohydrates found in potato tuber?

• sucrose

• starch

• glucose

• fructose

Which of the following statement is TRUE about lipids?

• Phospholipids have hydrophilic tails and hydrophobic

  heads.

• Glycerol, a building molecule of triglyceride is soluble in

  water.

• Fatty acid consists of a short hydrocarbon chain with a-

  OH group at one end.

• Saturated fatty acids have double bond while unsaturated

  fatty acid has no double bond between the carbon atoms.

Which of the following are TRUE for triglyceride?

I they are soluble in non-polar organic solvents

II they are not soluble in water

III they are esters formed from the reactions between fatty acids and alcohols.

• I and II

• I and III

• II and III

• I, II and III

Which of the following is produced from a condensation reaction during protein synthesis?

• Fat

• Water

• Dipeptide

• Maltose

Glutamic acid and lysine can be distinguished by

• their ability to form peptide bonds.

• their composition of their side chain.

• the position of their carboxyl groups.

• the position of their amino groups.

Which of the following is a purine?

• Cytosine

• Guanine

• Thymine

• Uracil

The two strands of polynucleotides in a DNA molecule are held together by

• peptide bond.

• hydrogen bond.

• glycosidic bond.

• phosphodiester bond.

Which of the following statements is NOT TRUE about nucleic acids?

I RNA molecule is longer than DNA molecule

II in the deoxyribose molecule, the oxygen at the second carbon is removed

III the bases involve in RNA is uracil, guanine, cytosine and adenine

IV the function of rRNA is to carry amino acid to the site of protein synthesis

• I and II

• II and III

• I and IV

• III and IV