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

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Structure and Properties of Peptides
The major element of secondary structure in myoglobin and hemoglobin is

the a-helix
the reverse turn
All of these
the P-strand

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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
Which of the three subunits of the G proteins binds GDP and GTP?

Delta
Alpha
Beta
Gamma

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Structure and Properties of Peptides
What is the effect of a decrease in pH on hemoglobin oxygen affinity?

Increase affinity in muscle cell otherwise decrease
No effect on oxygen affinity
Increase in oxygen affinity
Decrease in oxygen affinity

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Structure and Properties of Peptides
Hydrogen bonds in a-helices are

analogous to the steps in a spiral staircase
roughly parallel to the helix axis
more numerous than Vander Waals interactions
not present at Phe residues

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