Embibe Experts Solutions for Chapter: Biomolecules, Exercise 3: Level 3

The correct structure of histidine in a strongly acidic solution $(\mathrm{pH}=2)$ is:

Consider the following sequence for aspartic acid:

The $\mathrm{pI}$ (isoelectric point) of aspartic acid is:

The dipeptide, $\mathrm{Gln}-\mathrm{Gly},$ on treatment with ${\mathrm{CH}}_3\mathrm{COCl}$, followed by aqueous work up, gives:

The only two ${\mathrm{pK}}_{\mathrm{a}}$ values of an amino acid are $2.32$ and $9.62$. The isoelectric point of the amino acid is :

Which will not give purple colour with ninhydrin?

The pka values for the three ionizable groups$\mathrm{x},\mathrm{y}$ and $\mathrm{z}$of glutamic acid are $4.3, 9.7$ and $2.2$respectively

The isoelectric point for the amino acid is:

Glucose $+{\mathrm{NH}}_2-\mathrm{NH}-\mathrm{Ph}⟶$Product

($1 \mathrm{mole}$) ($\mathrm{X} \mathrm{gram}$)

Considering reaction took place with $100\%$ yield of major product find the value of $\mathrm{X}$

Amino acids are monomer of protein and these aminoacids are connected by peptide bond. A decapeptide (Mole wt. $796$) on complete hydrolysis gives glycine (Mole wt. $75$), alanine and phenylalanine. Glycine contributes $39.14\%$ to the total weight of the hydrolysed products. The number of glycine units present in the decapeptide is :