Multiple Choice Quiz

Multiple Choice Quiz

Multiple Choice Quiz


1		Which of the following amino acids has an amide side chain?
			A)	aspartic acid
			B)	glutamic acid
			C)	asparagine
			D)	methionine


2		Which of the following amino acids is achiral?
			A)	alanine
			B)	glycine
			C)	serine
			D)	cysteine


3		Which of the following amino acids does NOT have an aromatic ring?
			A)	tyrosine
			B)	histidine
			C)	tryptophan
			D)	proline


4		Which of the following ionic structures is NOT reasonable for histidine?
			A)
			B)
			C)
			D)


5		Which compound is an intermediate in the Strecker synthesis (RCHO, HCN, NH₃) of amino acids?
			A)	a
			B)	b
			C)	c
			D)	d


6		How would you accomplish the following synthesis of aspartic acid?
			A)	1. NH₃, HCN 2. H₃O⁺, H₂O, heat 3. NaOH 4. Neutralize
			B)	1. NH₃ 2. H₃O⁺, H₂O, heat
			C)	1. HCN 2. NH₃ 3. H₃O⁺, H₂O, heat
			D)	1. NH₃, HCN 2. H₃O⁺, H₂O, heat


7		What is the product of the following synthesis?
			A)
			B)
			C)
			D)


8		Which of the following structures is NOT a dipeptide?
			A)
			B)
			C)
			D)


9		The following peptide is hydrolyzed under strong acidic conditions. What are the products of the reaction?
			A)
			B)
			C)
			D)


10		A tripeptide contains glycine, alanine, and serine. How many different sequences are possible?
			A)	3
			B)	4
			C)	5
			D)	6


11		Which of the following is NOT a part of the primary protein structure?
			A)	the amino acid sequence
			B)	the disulfide linkages
			C)	the planar nature of the amide linkage
			D)	the conformation of the polypeptide backbone


12		Which of the following is the correct structure of the tripeptide Gly–Phe–Ala?
			A)
			B)
			C)
			D)


13		Which of the following statements about the conformation (secondary and tertiary structure) of proteins is FALSE?
			A)	The four atoms of an amide linkage (–CO–NH–) lie in a plane as a result of resonance between the nitrogen and the carbonyl group.
			B)	Electrostatic attraction occurs between basic and acidic side chains.
			C)	The favored conformation of a protein is always that which has the greatest number of hydrogen bonds.
			D)	The presence of the amino acid proline has the effect of turning a corner in a protein.


14		Which of the following statements about the arrangement of a protein in three dimensions is FALSE?
			A)	As a result of hydrogen bonding, a portion of a protein may exist as a right-handed α-helix with 3.6 amino acid residues per turn, and a repeat unit of 5.4 Å.
			B)	As a result of hydrogen bonding a portion of a protein may exist as a pleated sheet, in which the repeat unit is 7.0 Å.
			C)	In a pleated sheet, the polyamide chains may be parallel or antiparallel.
			D)	A portion of a protein may exist as a flat sheet with a repeat unit of 7.2 Å.


15		Which of the following is NOT an example of secondary structure found in proteins?
			A)	β-pleated sheet
			B)	α-helix
			C)	hydrophobic folding
			D)	random coil


16		What does the quaternary structure of a protein involve?
			A)	the association of two or more peptide chains
			B)	the complete three-dimensional conformation
			C)	partial denaturation
			D)	random coil alternating with α-helix


17		Which of the following is not considered part of the tertiary structure of proteins?
			A)	the hydrophobic effect
			B)	the restricted rotation in amide bonds
			C)	the electrostatic interactions
			D)	the hydrogen bonds


18		Which of the following statements about an enzyme is FALSE?
			A)	An enzyme is usually a large protein.
			B)	An enzyme is a catalyst for biological reactions.
			C)	An enzyme is a chiral molecule.
			D)	An enzyme changes the equilibrium constant of a reaction.


19		What is the main function of enzymes in biological systems?
			A)	catalysis of a reaction
			B)	altering the equilibrium of a reaction
			C)	energy transport
			D)	protein sysnthesis

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