Which is correct for α-helix of a protein (1) It has H-bonding in two or more parallel running chains (2) There is intra-chain H-bonding in single helix (3) No H- […]
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CSIR PYQ Biochemistry-Conformation of Proteins
Understanding Amino Acid Propensity in Protein Secondary Structure
The following statements describe the propensity and role of amino acids in the secondary structure of proteins A. Alanine has a high frequency of occurrence in α- helices B. Proline […]
CSIR PYQ Biochemistry-Conformation of Proteins
Time Required for a Polypeptide Backbone to Explore All Possible Conformations
How long should it take the polypeptide backbone of a 6-residue, 10-residue, 15-residue and 20- residue folding nucleus to explore all its possible conformations? Assume that the polypeptide backbone randomly […]
CSIR PYQ Biochemistry-Conformation of Proteins
Estimating Possible Conformations of a 51-Residue Protein
Consider a 51-residue long protein containing only 100 bonds about which rotation can occur. Assume that 3 orientations per bond are possible. Based on these assumptions, how many conformations will […]
CSIR PYQ Biochemistry-Conformation of Proteins
Determining the Length of an α-Helical Section in a Membrane
26. The length of an α-helical section of a polypeptide chain of 20 residues spanning hydrophobic region of membrane would be (1) 30 A (2) 54 A (3) 5.4 A […]
CSIR PYQ Biochemistry-Conformation of Proteins
Understanding Nucleic Acid and Protein Structures:
Indicate which one of the following statements about nucleic acids and protein structures is correct. (1) Hydrogen bonding between the bases in the major and minor grooves of DNA is […]
CSIR PYQ Biochemistry-Conformation of Proteins
Collagen: Triple Helix, Amino Acid Composition, and Stability
The following statements were made to describe a typical collagen structure. A. Collagen has a triple-helical domain structure which consists of three distinct α-chains. B. The collagen triple helix is […]
CSIR PYQ Biochemistry-Conformation of Proteins
Beta-Turns in Proteins: Structure
23. Following are statements on ß-turns: A. All the 20 coded amino acids have equal propensity to form ß -turns. B. Pro cannot occur in ß-turns. C. Pro-Gly sequence strongly […]
CSIR PYQ Biochemistry-Conformation of Proteins
Ramachandran Plot and Protein Conformation Analysis
In a 30-residue peptide, the dihedral angles φ/Ψ have been determined by one or more methods. When their values are examined in the Ramachandran plot, it is (1) not possible […]
CSIR PYQ Biochemistry-Conformation of Proteins
Determining Backbone Dihedral Angles in Folded Proteins
The exact backbone dihedral angles in a folded protein can be obtained by (1) deconvolution of its circular dichroism spectra obtained at different pH and temperature (2) estimating the number […]
