Embibe Experts Solutions for Chapter: Biomolecules, Exercise 1: KVPY Aptitude Test - Stream SX (19 Nov 2017)

The average energy of each hydrogen bond in $\mathrm{A}-\mathrm{T}$ pair is $\mathrm{x} \mathrm{kcal}$${\mathrm{mol}}^{-1}$ and that in $\mathrm{G}-\mathrm{C}$ pair is $\mathrm{y} {\mathrm{kcalmol}}^{-1}$. Assuming that no other interaction exists between the nucleotides, the approximate energy required in ${\mathrm{kcalmol}}^{-1}$ to split the following double stranded $\mathrm{DNA}$ into two single strands is

[Each dashed line may represent more than one hydrogen bond between the base pairs]

A tetrapeptide is made of naturally occurring alanine, serine, glycine and valine. If the $\mathrm{C}$-terminal amino acid is alanine and the $\mathrm{N}$-terminal amino acid is chiral, the number of possible sequences of the tetrapeptide is

The following tripeptide

can be represented as

Sugar moiety in DNA and RNA molecules respectively are

If $\alpha -D-$ glucose is dissolved in water and kept for a few hours, the major constituent(s) present in the solution is (are)

Among the $\mathrm{\alpha }$ -amino acid-threonine, tyrosine, methionine, arginine and tryptophan, those which contain an aromatic group in their side chain are

The reaction of $\mathrm{D}-$glucose with ammoniacal ${\mathrm{AgNO}}_3$ produces:

Given the structure of $D-\left(+\right)-$ glucose as



The structure of $L-\left(-\right)-$ glucose is