#Q12 What is the net charge of the peptide Tyr-Val-Arg at pH 5.0? The pKas of alpha amino and carboxyl groups are 9.6 and 2.3, respectively. The pKas of Tyr and Arg side chains are 10.46 and 12.48, respectively

#Q13 Which one of the following pair of amino acids are glucogenic and ketogenic in nature ?

#Q15 Several proteins are modified by phosphorylation at specific amino acid residues to alter their activities. Which one of the following amino acids is NOT typically a site of phosphorylation in proteins ?

#Q16 Which among the following is the simplest method to estimate the concentration of glycerol in an aqueous solution of glycerol ?

#Q17 Chirality of DNA is due to

#Q18 DNA is not hydrolyzed by alkali whereas RNA is readily hydrolyzed. This is due to

#Q19 On sequence analysis of a double stranded DNA, the results showed the content of cytosine, C was 20%. What is the amount of A and T put together ?

#Q20 Which one of the following interactions plays a major role in stabilizing B-DNA ?

#Q21 The maximum number of hydrogen bonds that can form between H2N - NH2 (hydrazine) and water is

#Q23 In a hydrogen bond of the type D-H...A, where D-H is a weakly acidic donor group and A is a lone-pair-bearing acceptor atom, the D...A distance is

#Q24 On the molar scale which of the following interaction in a nonpolar environment provides the highest contribution to the bio-molecule?

#Q25 The free energy ∆G of a dissolved solute

#Q26 Which one of the following non-covalent interactions between two non-bonded atoms A and B is most sensitive to the distance between them ?

#Q22 Out of the following hydrogen bonding schemes shown by ... which one corresponds to the weakest hydrogen bond in a given solvent condition ?

#Q27 Equal volumes of pH 4.0 and pH 10.0 solutions are mixed. What will be the approximate pH of the final solution ?

#Q28 100 ml of 0.02 M acetic acid (pKa= 4.76) is titrated with 0.02 N KOH. After adding some base to the acid solution, the observed pH is 2.76. At this pH degree of protonation is

#Q29 100 ml of 0.1 M sodium acetate solution has a pH of 8.90. To this solution 1000 μl of 1M acetic acid (pKa = 4.76) of pH 2.80 is added. The pH of this mixture will be: