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Home ‣ Biochemistry ‣ Structure and Properties of Peptides Comments
- Question
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
- Correct Answer
- regular folding of regions of the polypeptide chain
- 1. What is the proportion of glycine residues in collagenous regions?
Options- A. One-fourth
- B. One-third
- C. Half
- D. One-tenth Discuss
- 2. 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 Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. Disulfide bonds most often stabilize the native structure of
Options- A. extracellular proteins
- B. dimeric proteins
- C. hydrophobic proteins
- D. intracellular proteins Discuss
- 8. 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
- 9. The Ramachandran Plot illustrates the fact that
Options- 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 Discuss
- 10. The peptide, Val-Lys-Glu-Met-Ser-Trp-Arg-Ala, was digested with cyanogen bromide (CNBr) to produce:
Options- A. Val-Lys + Glu-Met-Ser + Trp-Arg-Ala
- B. Val-Lys-Glu-Met-Ser-Trp + Arg-Ala
- C. Val-Lys-Glu-Met + Ser-Trp-Arg-Ala
- D. Val-Lys-Glu + Met-Ser-Trp-Arg-Ala Discuss
Structure and Properties of Peptides problems
Search Results
Correct Answer: One-third
Correct Answer: globular proteins
Correct Answer: phospho-diester bonds
Correct Answer: hydrophobic residues
Correct Answer: have Y = F = 180°
Correct Answer: Decrease in oxygen affinity
Correct Answer: extracellular proteins
Correct Answer: C20H32O11N10
Correct Answer: the F & Y angles can assume approximately three different values
Correct Answer: Val-Lys-Glu-Met + Ser-Trp-Arg-Ala
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