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Structure and Properties of Peptides

Structure and Properties of Peptides
Heme is the binding pocket of myoglobin and hemoglobin and is composed of

positively charged residues
hydrophobic residues
polar residues
negatively charged residues

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

Gamma
Beta
Delta
Alpha

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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
Which of the following is an example of tertiary structure in a protein?

A P-pleated sheet
A globular domain
An a-helix
A multimeric protein

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Structure and Properties of Peptides
In the β-pleated sheet

the polypeptide chain is fully extended
adjacent polypeptide chains can either be parallel or antiparallel
hydrogen bonds are formed between the peptide bonds
All of these

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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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