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A peptide bond contains this kind of functional group: (10 points)

	Ketal
	Amide
	Hydroxyl
	Primary amine
	Imine
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written by dr_g • topics: proteins block unblock • peptides block unblock • biochemistry block unblock • pharmacy block unblock

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Peptide bonds have restricted rotation due to the partial double bond character between the (10 points)

	Peptide bond N and H atoms
	Calpha and peptide bond N atoms
	Calpha and carbonyl C atoms
	Carbonyl C and peptide bond N atoms
	Calpha and carbonyl O atoms
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written by dr_g • topics: proteins block unblock • peptides block unblock • biochemistry block unblock • pharmacy block unblock

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In a peptide bond, the attached atoms: (20 points)

	Are mostly in the iminol tautomer
	Are nonpolar
	Cannot be represented as resonance forms
	Can be in cis or trans configurations
	Are not the same plane
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written by dr_g • topics: proteins block unblock • peptides block unblock • biochemistry block unblock • pharmacy block unblock

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The sequence of amino acids in a protein is: (10 points)

	The tertiary structure
	The primary structure
	The quaternary structure
	The supersecondary structure
	The secondary structure
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written by dr_g • topics: proteins block unblock • peptides block unblock • biochemistry block unblock • pharmacy block unblock

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Cyclophilin, a target of the immunosuppressant drug cyclosporin A: (20 points)

	Alters the side chains of amino acids in a protein
	Increases the rate of interconversion between the cis and trans form of peptide bonds
	Alters the sequence of amino acids in a protein
	Helps to match correct disulfide bonds between different cysteine residues
	Is also known as a heat shock protein
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written by dr_g • topics: proteins block unblock • peptides block unblock • biochemistry block unblock • pharmacy block unblock

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The protein's three-dimensional structure as defined by the atomic coordinates. (30 points)

	The primary structure
	The tertiary structure
	The oligomeric protein complex
	The secondary structure
	The quaternary structure.
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written by dr_g • topics: proteins block unblock • peptides block unblock • biochemistry block unblock • pharmacy block unblock

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In an alpha-helix, the hydrogen attached to the nitrogen in a peptide bond forms hydrogen bonds to the carbonyl oxygen _____ amino acids behind in sequence: (30 points)

	6
	3
	4
	5.2
	3.6
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written by dr_g • topics: proteins block unblock • peptides block unblock • biochemistry block unblock • pharmacy block unblock

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In a parallel sheet, the polypeptides (10 points)

	Are extended in the same direction.
	Are extended in opposite directions.
	Are helical and left handed.
	Do not have secondary structure.
	Are helical and right handed.
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written by dr_g • topics: biochemistry block unblock • pharmacy block unblock • proteins block unblock • peptides block unblock

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The following is an example of super-secondary structure: (20 points)

	Proteins that are more dense than water
	beta-strand
	Helix-turn-helix
	Quaternary structure
	A globulin
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written by dr_g • topics: proteins block unblock • peptides block unblock • biochemistry block unblock • pharmacy block unblock

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In an antiparallel sheet, the polypeptides (10 points)

	Are helical and left handed.
	Are extended in the same direction.
	Are extended in opposite directions.
	Do not have secondary structure.
	Are helical and right handed.
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