Molecules Of Life 1.1 - 1.3

Which of the following properties of water are a result of intermolecular forces?

• High surface tension and good solvent

• High surface tension, good solvent and cohesive

• High surface tension and good solvent and high specific heat capacity

• High surface tension, good solvent, cohesive and high specific heat capacity

Water is a polar molecule. What does this statement mean?

• That water is one of the many hydrophobic molecules

• That water molecules are linear, like a pole

• That atoms in the molecules have partial charges as a result of unequal sharing of electrons in a covalent bond

• That the atoms in water have equal electronegatives

In a group of water molecules, hydrogen bonds form between which of the following?

• The oxygen atoms in different water molecules

• Two hydrogen atoms in different water molecules

• The oxygen atom in one water molecule and a hydrogen atom in another water molecule

• The hydrogen atoms in a single water molecule

Sweating has a cooling effect because of water's high __________________

• specific heat of capacity

• cohesion of water molecules

• hydrophobic interaction

• latent heat of vaporisation

Which of the following occurs because molecules of water are farther apart in ice than in liquid water?

• Ice expands when it melts

• Ice floats

• Ice vaporises before liquid water does

• Ice is denser than liquid water

Which bonds are found in glycogen?

• A

• B

• C

• D

Which of the molecules below is α-glucose?

• A

• B

• C

• D

The diagrams below show a number of biological molecules.

• I only

• I and II only

• I, II and IV

• I and III only

Which of the following statements is true?

• Many condensation reactions in the breakdown of amylose and amylopectin, release stored energy.

• The amylose-amylopectin complex is insoluble, so it does not affect the water potential of the cell.

• Many hydrolysis reactions in the formation of amylose and amylopectin allow the release of stored energy to fuel cellular processes.

• Amylose has a branched structure and amylopectin is coiled to give a compact structure for transport around the plant through the phloem.

Which of the statements below correctly describes a disaccharide?

• Sugars formed from two subunits joined together by a peptide bond that forms during a hydrolysis reaction.

• Sugars formed from two subunits joined together by a glycosidic bond that forms during a hydrolysis reaction.

• Sugars formed from two subunits joined together by a glycosidic bond that forms during a condensation reaction.

• Starches formed from two subunits joined together by a peptide bond that forms during a condensation reaction.