Chapter 1 : Molecules of Life

Water is a universal solvent due to its…

• low viscosity.
• polar molecules.
• high boiling point.
• high specific heat capacity.

What determines the cohesiveness of water molecules?

• Ionic bonds.
• Hydrogen bonds.
• Nonpolar covalent bonds.
• Hydrophobic interactions.

Glucose dissolves in water because…

• it ionizes.
• it is hydrophobic.
• it is a polysaccharide.
• it has polar hydroxyl groups that interact with polar water molecules.

Maltose is composed of two glucose molecules joined by a glycosidic linkage. How is maltose classified?

• As a pentose.
• As a monosaccharide.
• As a disaccharide
• As a polysaccharide.

The hydrolysis of triglyceride will yield…

• three fatty acids and one glycerol.
• three glycerols and one fatty acid.
• two fatty acids and three glycerols.
• one fatty acid, one amino acid and one glucose.

The unique characteristic of each amino acid is determined by…

• its R groups.
• its amino group.
• the type of peptide bond.
• its position on the polypeptide chain.

Which statement about the deoxyribonucleic acid molecule is NOT TRUE?

• It contains genetic information in its nucleotide.
• It consists of two strands which are parallel to one another.
• It contains the bases adenine, guanine, thymine and cytosine.
• Its sugar unit is deoxyribose which has a hydrogen group attached to the second carbon.

If one strand of a DNA molecule has the sequence of bases 5’ATTGCA3’, the other complementary strand would have the sequence of…

• 5’TAACGT3
• 3’TAACGT5’
• 5’UAACGU3’
• 3’UAACGU5’

Which of the following statement is (are) the characteristics of lipids?

• I and II only
• I and III only
• II and III only
• I, II and III

In the diagram below, the chemical reaction results in the formation of a (an)…

• ionic bond.
• peptide linkage.
• ester linkage.
• glycosidic linkage.