Chemistry 12 - Chapter 2 Quiz

Name:

True/False

Indicate whether the sentence or statement is true or false.

Polymers such as nylon are formed from monomer subunits that are identical.

The vulcanization of rubber involves sulfur in forming crosslinkages.

Thermoplastics can be softened by heat and moulded into a new shape.

Amino acids contain a hydrocarbon chain with an amino group at one end and a carboxyl group at the other end.

Starch, sucrose, and cellulose are polysaccharides of the monosaccharide glucose.

Multiple Choice

Identify the letter of the choice that best completes the statement or answers the question.

Polyethylene is

a.	an addition polymer of ethyl ethanoate.
b.	a condensation polymer of ethene.
c.	a condensation polymer of ethyl ethanoate.
d.	a saturated hydrocarbon.
e.	an unsaturated hydrocarbon.

A monomer of a condensation polymer

a.	contains an amino group.
b.	contains a carboxyl group.
c.	contains a double bond.
d.	reacts in a condensation reaction.
e.	reacts to form an ester.

The polymer produced from the polymerization of HOOCCOOH and HOCH₂CH₂OH is

Carbohydrates

a.	are polymers of glucose.
b.	are polymers of sucrose.
c.	are polymers that make up enzymes.
d.	contain only carbon atoms and water molecules.
e.	contain only carbon, hydrogen, and oxygen atoms.

10.

Amino acids

a.	are the monomers of nucleic acids.
b.	are the monomers of fatty acids.
c.	are the monomers of proteins.
d.	polymerize by forming ester linkages.
e.	undergo condensation reactions to eliminate ammonia molecules.

11.

The process by which triglycerides are broken down in the presence of NaOH to glycerol and the sodium salts of fatty acids is called

12.

Deoxyribonucleic acid

a.	acts as energy storage for the cell.
b.	determines the primary structure of proteins.
c.	forms peptide bonds with the amine group of amino acids.
d.	is a polymer of the monomers adenine, lysine, glycine, and cysteine.
e.	provides structure and support in the nucleus of the cell.

13.

Fats are different from oils in that they

a.	are more soluble in aqueous solvents.
b.	contain fatty acid chains that are more closely packed together.
c.	contain more carbon–carbon double bonds.
d.	have lower melting points.
e.	undergo condensation reactions with glycerol.

14.

The secondary and tertiary structures of proteins

a.	are a result of hydrogen bonding between the ribose–phosphate backbone of the polymer chains.
b.	are determined by the primary structure, the sequence of nucleic acids in the protein.
c.	indicate the position of the hydroxyl groups in the carbon chain of the polymer.
d.	result from hydrogen bonding between the adenine and thymine bases and the cytosine and guanine bases.
e.	result in the protein being globular, as in some enzymes, or fibrous, as in muscle fibres.

15.

There is an enormous variety of proteins because

a.	DNA consists of at least 20 amino acids which code for proteins.
b.	DNA consists of 4 different amino acids which code for proteins.
c.	proteins are made up of 20 different amino acids that can be combined to form millions of sequences.
d.	proteins are made up of 4 different amino acids in coded sequence.
e.	proteins are synthesized from groups of three amino acids for each nucleotide.