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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