Biochemistry - Structure and Properties of Peptides
Exercise :: Structure and Properties of Peptides - Section 1
- Structure and Properties of Peptides - Section 1
6. |
In deoxy hemoglobin (Hb), the Fe (II) is coordinated to |
A. |
four nitrogens of heme, the proximal His, and a water molecule | B. |
four nitrogens of heme and to a water molecule | C. |
two nitrogens of heme and to three His residues in Hb | D. |
two nitrogens of heme and to three water molecules |
Answer: Option A
Explanation:
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7. |
In the β-pleated sheet |
A. |
hydrogen bonds are formed between the peptide bonds | B. |
adjacent polypeptide chains can either be parallel or antiparallel | C. |
the polypeptide chain is fully extended | D. |
all of the above |
Answer: Option D
Explanation:
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8. |
The Ramachandran Plot illustrates the fact that |
A. |
the peptide bond is planar | B. |
the F & Y angles can assume any value in a peptide | C. |
the F & Y angles can assume only a single value in a protein | D. |
the F & Y angles can assume approximately three different values |
Answer: Option D
Explanation:
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9. |
The resonance structures that can be drawn for the peptide bond indicate that the peptide bond |
A. |
is stronger than an ordinary single bond | B. |
has partial double bond character | C. |
both (a) and (b) | D. |
is still not completely understood |
Answer: Option C
Explanation:
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10. |
The major element of secondary structure in myoglobin and hemoglobin is |
A. |
the P-strand | B. |
the a-helix | C. |
the reverse turn | D. |
All of these |
Answer: Option B
Explanation:
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