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Home ‣ Biochemistry ‣ Structure and Properties of Peptides Comments
- Question
An oil drop with a polar coat is a metaphor referring to the three dimensional structure of
Options- A. fibrous proteins
- B. collagen
- C. globular proteins
- D. silk protein
- Correct Answer
- globular proteins
- 1. The different orders of protein structure are determined by all of the following bond types except
Options- A. peptide bonds
- B. phospho-diester bonds
- C. disulfide bridges
- D. hydrogen bonds Discuss
- 2. Heme is the binding pocket of myoglobin and hemoglobin and is composed of
Options- A. negatively charged residues
- B. polar residues
- C. hydrophobic residues
- D. positively charged residues Discuss
- 3. Peptides in the fully extended chain conformation
Options- A. have Y = F = 180°
- B. do not occur in nature
- C. also have a cis geometry in their peptide bonds
- D. are equivalent to the (3-sheet structure Discuss
- 4. The nature of peptide bond can be best explained as
Options- A. partial double bond
- B. truly double bond
- C. Hydrogen bond
- D. Van der waals force Discuss
- 5. The oxygen in hemoglobin and myoglobin is bound to
Options- A. the iron atom in the heme group
- B. the nitrogen atoms on the heme
- C. histidine residues in the protein
- D. lysine residues in the protein Discuss
- 6. What is the proportion of glycine residues in collagenous regions?
Options- A. One-fourth
- B. One-third
- C. Half
- D. One-tenth Discuss
- 7. Secondary structure in protein refers to
Options- A. linear sequence of amino acids joined together by peptide bond
- B. three dimensional arrangement of all amino acids in polypeptide chain
- C. regular folding of regions of the polypeptide chain
- D. protein made up of more than one polypeptide chain Discuss
- 8. What is the effect of a decrease in pH on hemoglobin oxygen affinity?
Options- A. Decrease in oxygen affinity
- B. Increase in oxygen affinity
- C. No effect on oxygen affinity
- D. Increase affinity in muscle cell otherwise decrease Discuss
- 9. Disulfide bonds most often stabilize the native structure of
Options- A. extracellular proteins
- B. dimeric proteins
- C. hydrophobic proteins
- D. intracellular proteins Discuss
- 10. The molecular formula for glycine is C2H5O2N. What would be the molecular formula for a linear oligomer made by linking ten glycine molecules together by condensation synthesis?
Options- A. C20H50O20N10
- B. C20H32O11N10
- C. C20H40O10N10
- D. C20H68O29N10 Discuss
Structure and Properties of Peptides problems
Search Results
Correct Answer: phospho-diester bonds
Correct Answer: hydrophobic residues
Correct Answer: have Y = F = 180°
Correct Answer: partial double bond
Correct Answer: the iron atom in the heme group
Correct Answer: One-third
Correct Answer: regular folding of regions of the polypeptide chain
Correct Answer: Decrease in oxygen affinity
Correct Answer: extracellular proteins
Correct Answer: C20H32O11N10
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