Exercise: Structure And Properties Of Peptides

Questions for: Structure And Properties Of Peptides

Secondary structure in protein refers to
A:
linear sequence of amino acids joined together by peptide bond
B:
three dimensional arrangement of all amino acids in polypeptide chain
C:
regular folding of regions of the polypeptide chain
D:
protein made up of more than one polypeptide chain
Answer: C
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Disulfide bonds most often stabilize the native structure of
A:
extracellular proteins
B:
dimeric proteins
C:
hydrophobic proteins
D:
intracellular proteins
Answer: A
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The same peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala. was digested with chymotrypsin to produce
A:
Val-Lys + Glu-Met-Ser + Trp-Arg-Ala.
B:
Val-Lys-Glu-Met-Ser-Trp + Arg-Ala.
C:
Val-Lys-Glu-Met-Ser + Trp-Arg-Ala.
D:
Val-Lys-Glu-Met + Ser-Trp-Arg-Ala.
Answer: B
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In β-pleated sheet structures neighbouring
A:
chains lie in a flat plane
B:
neighboring residues are hydrogen bonded
C:
neighboring chains are connected by a-helices
D:
neighboring chains are hydrogen bonded
Answer: D
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What was the first protein whose complete tertiary structure was determined?
A:
Lysozyme
B:
Myoglobin
C:
Pancreatic ribonuclease
D:
Pancreatic DNase
Answer: B
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