Biomolecules

The correct statement(s) regarding sugars is(are) :

A known artificial sweetener $\mathbf{X}$ is composed of 4-chloro-4-deoxy- $\alpha$-D-galactose and 1,6-dichloro-1,6-dideoxy- $\beta$-D-fructose joined by a glycosidic linkage. Structure of D-galactose is given below :

The correct structur...

A linear octasaccharide (molar mass $=1024 \mathrm{~g} \mathrm{~mol}^{-1}$ ) on complete hydrolysis produces three monosaccharides: ribose, 2-deoxyribose and glucose. The amount of 2-deoxyribose formed is $58.26 \%(\mathrm{w} / \mathrm{w})$...

For a double strand DNA, one strand is given below:

The amount of energy required to split the double strand DNA into two single strands is _______ kcal $\operatorname{mol}^{-1}$.

[Given: Average energy per H-bond for A-T base pair $=1.0 ...

A disaccharide $\mathbf{X}$ cannot be oxidised by bromine water. The acid hydrolysis of $\mathbf{X}$ leads to a laevorotatory solution. The disaccharide $\mathbf{X}$ is :

Treatment of D-glucose with aqueous $\mathrm{NaOH}$ results in a mixture of monosaccharides, which are

Given : The compound(s), which on reaction with HNO3 will give the product having degree of rotation, [\(\alpha\)]D = \(-\)52.7\(^\circ\) is (are)

The structure of a peptide is given below. If the absolute values of the net charge of the peptide at $\mathrm{pH}$ $=2$, $\mathrm{pH}=6$, and $\mathrm{pH}=11$ are $\left|Z_1\right|,\left|Z_2\right|$, and $\left|Z_3\right|$, respectively, t...

Which of the following statement(s) is(are) true?

The Fischer presentation of \(D\)-glucose is given below.

The correct structure(s) of \(\beta\)-\(L\)-glucopyranose is (are) :

For "invert sugar", the correct statement(s) is(are)
(Given : specific rotations of (+)-sucrose, (+)-maltose, L-(\(-\))-glucose and L-(+)-fructose in aqueous solution are +66\(^\circ\), +140\(^\circ\), \(-\)52\(^\circ\) and +92\(^\circ\), r...

The structure of D-(+)-glucose is

The structure of L-(\(-\))-glucose is

The total number of distinct naturally occurring amino acids obtained by complete acidic hydrolysis of the peptide shown below is

The total number of lone-pairs of electrons in melamine is

A tetrapeptide has \(-\)COOH group on alanine. This produces glycine (Gly), valine (Val), phenyl alanine (Phe) and alanine (Ala), on complete hydrolysis. For this tetrapeptide, the number of possible sequences (primary structures) with $$-$...

The substituents R1 and R2 for nine peptides are listed in the table given below. How many of these peptides are positively charged at pH = 7.0 ?


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The following carbohydrate is

A decapeptide (mol. wt. 796) on complete hydrolysis gives glycine (mol. wt. 75), alanine and phenylalanine. Glycine contributes 47.0% to the total weight of the hydrolysed products. The number of glycine units present in the decapeptide is ...

The total number of basic groups in the following form of lysine is

The correct statement about the following disaccharide is :

The correct statement(s) about the following sugar X and Y is(are)

Cellulose upon acetylation with excess acetic anhydride/H\(_2\)SO\(_4\) (catalytic) gives cellulose triacetate whose structure is :

Statement-1 : Glucose gives a reddish-brown precipitate with Fehling's solution.
Statement-2 : Reaction of glucose with Fehling's solution gives \(\mathrm{CuO}\) and gluconic acid.

Which of the following disaccharide will not reduce Tollen's reagent?