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Home⇒ Medical Science⇒ Biochemistry⇒ Structure and properties of peptides

1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. .

2-Wrong options are also given but dont concentrate there, Right answer is in bold format.

Q1 ⇒ Which of the following is an example of tertiary structure in a protein?
A globular domain
[other wrong options] [Discuss in forum] 3 -2

Q2 ⇒ The resonance structures that can be drawn for the peptide bond indicate that the peptide bond
both (a) and (b)
[other wrong options] [Discuss in forum] 3 -2

Q3 ⇒ Heme is the binding pocket of myoglobin and hemoglobin and is composed of
hydrophobic residues
[other wrong options] [Discuss in forum] 4 -2

Q4 ⇒ When pO₂ = K_d of myoglobin, the fractional saturation (Y_O2) is about
0.5
[other wrong options] [Discuss in forum] 3 -2

Q5 ⇒ The peptide bond in proteins is
usually trans unless proline is the next amino acid
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Q6 ⇒ In the β-pleated sheet
all of the above
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Q7 ⇒ Disulfide bonds most often stabilize the native structure of
extracellular proteins
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Q8 ⇒ Which hemoglobin chain replaces the beta chain in embryonic hemoglobulin?
Epsilon
[other wrong options] [Discuss in forum] 1 -1

Q9 ⇒ The peptide bond in proteins is
planar, and usually found in a trans conformation
[other wrong options] [Discuss in forum] 1 -4

Q10 ⇒ The oxygen binding curves of hemoglobin and myoglobin
both (a) and (b)
[other wrong options] [Discuss in forum] 1 -1

Q11 ⇒ If the F and Y angles of each peptide unit in a protein are known, which of the following may also be determined?
Complete secondary structure
[other wrong options] [Discuss in forum] 1 -1

Q12 ⇒ 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?
C₂₀H₃₂O₁₁N₁₀
[other wrong options] [Discuss in forum] 1 -4

Q13 ⇒ The Ramachandran Plot illustrates the fact that
the F & Y angles can assume approximately three different values
[other wrong options] [Discuss in forum] 2 -1

Q14 ⇒ Secondary structure in protein refers to
regular folding of regions of the polypeptide chain
[other wrong options] [Discuss in forum] 1 -1

Q15 ⇒ Hemoglobin has quaternary structure and is made up of
four polypeptide chains, two α-chains and two β-chains
[other wrong options] [Discuss in forum] 1 -1

Q16 ⇒ An oil drop with a polar coat is a metaphor referring to the three dimensional structure of
globular proteins
[other wrong options] [Discuss in forum] 1 -1

Q17 ⇒ What is the proportion of glycine residues in collagenous regions?
One-third
[other wrong options] [Discuss in forum] 1 -1

Q18 ⇒ The oxygen in hemoglobin and myoglobin is bound to
the iron atom in the heme group
[other wrong options] [Discuss in forum] 1 -1

Q19 ⇒ Hydrogen bonds in a-helices are
roughly parallel to the helix axis
[other wrong options] [Discuss in forum] 2 -1

Q20 ⇒ In deoxy hemoglobin (Hb), the Fe (II) is coordinated to
four nitrogens of heme, the proximal His, and a water molecule
[other wrong options] [Discuss in forum] 1 -1

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