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Structure and Properties of Peptides

Structure and Properties of Peptides
The heme is held in place by a bond between

the Fe2+ and cysteine
the Fe3+ and histidine
the Fe2+ and histidine
the Fe3+ and cysteine

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Structure and Properties of Peptides
The nature of peptide bond can be best explained as

Van der waals force
Hydrogen bond
truly double bond
partial double bond

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Structure and Properties of Peptides
The same peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala. was digested with chymotrypsin to produce

Val-Lys-Glu-Met-Ser-Trp + Arg-Ala.
Val-Lys-Glu-Met + Ser-Trp-Arg-Ala.
Val-Lys-Glu-Met-Ser + Trp-Arg-Ala.
Val-Lys + Glu-Met-Ser + Trp-Arg-Ala.

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Structure and Properties of Peptides
The oxygen binding curves of hemoglobin and myoglobin

are identical
allow maximum transfer of oxygen to the tissues
both (a) and (b)
are a consequence of the quaternary structure of hemoglobin

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Structure and Properties of Peptides
What was the first protein whose complete tertiary structure was determined?

Pancreatic ribonuclease
Myoglobin
Lysozyme
Pancreatic DNase

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Structure and Properties of Peptides
The oxygen in hemoglobin and myoglobin is bound to

the iron atom in the heme group
the nitrogen atoms on the heme
lysine residues in the protein
histidine residues in the protein

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