Biomolecules

Which of the following compounds will behave as a reducing sugar in an aqueous KOH solution ?

Among the following, the essential amino acid is :

The incorrect statement among the following is :

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°, +140°, −52° and +92°, respectively)

The compound T is

Thiol group is present in :

Assertion : Rayon is a semisynthetic polymer whose properties are better than natural cotton.

Reason : Mechanical and aesthetic properties of cellulose can be improved by acetylation.

Consider the following sequence for aspartic acid :

The pI (isoelectric point) of aspartic acid is :

Observation of "Rhumann's purple" is a confirmatory test for the presence of :

The structure of D-(+)-glucose is shown (Fischer projection: CHO at top; OH on the right, left, right and right at C2, C3, C4 and C5; CH₂OH at the bottom).

The structure of L-(−)-glucose is

The major product of the reaction is

Which of the vitamins given below is water soluble ?

Complete hydrolysis of starch gives :

Accumulation of which of the following molecules in the muscles occurs as a result of vigorous exercise ?

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

Which one of the following bases is not present in DNA ?

Which of the following will not show mutarotation ?

The reason for double helical structure of DNA is the operation of :

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 $\ce{-NH2}$ group attached to a chiral center is

The substituents $\mathbf R_1$ and $\mathbf R_2$ for nine peptides are listed in the table given below. How many of these peptides are positively charged at pH = 7.0?

$$\ce{H3N+-CH(H)-CO-NH-CH(R1)-CO-NH-CH(R2)-CO-NH-CH(H)-COO-}$$

Peptide	$\mathbf R_1$	$\mathbf R_2$
I	H	H
II	H	$\ce{CH3}$
III	$\ce{CH2COOH}$	H
IV	$\ce{CH2CONH2}$	$\ce{(CH2)4NH2}$
V	$\ce{CH2CONH2}$	$\ce{CH2CONH2}$
VI	$\ce{(CH2)4NH2}$	$\ce{(CH2)4NH2}$
VII	$\ce{CH2COOH}$	$\ce{CH2CONH2}$
VIII	$\ce{CH2OH}$	$\ce{(CH2)4NH2}$
IX	$\ce{(CH2)4NH2}$	$\ce{CH3}$