Biomolecules Test

Directions For Questions

An amino acid is characterized by two

pka

values the one corresponding to the more acidic site is designated as

pka_1

and the other corresponding to the less acidic site is designated as

pka_2

. The isoelectric point also called isoionic point

(pI)

is the

pH

at which concentration of zwitterion is maximum.

pI

is the average of

pka_1

and

pka_2

. Generally the value of

pI

is slightly less than

7

.
Some amino acids have side chain with acidic or basic groups. These amino acids have

pka_3

value also for the side chain. The acidic amino acids have acidic side chains basic amino acids have basic side chains.

pI

for an acidic amino acid is an average of

pka_1

and

pka_3

pI

of a basic amino acid is the average of

pka_2

and

pka_3

S. No.	Amino acid	$P^{ka1}$	$P^{ka2}$	$P^{ka3}$ (side chain)
I	Aspartic acid	$1.88$	$9.6$	$3.65$
II	Glutamic acid	$2.19$	$9.67$	$4.25$
III	Lysine	$2.18$	$8.95$	$10.53$
IV	Arginine	$2.17$	$9.04$	$12.48$

...view full instructions

Biomolecules Te...

Question 1

Disaccharide

Monosaccharide

Polysaccharide

Trisaccharide

Question 2

d-fructose

d-glucose

Sucrose

Lactose

Question 3

Glucose in aqueous solution

Proteins in blood

Iodine in aqueous solution

Urea in blood

Question 4

I, II

I, III

II, III

I, II & IV

Question 5

Only I

Only II

I and III

I, III, IV

Question 6

Same osazone

Same acid on oxidation

Same alcohol when reduced

Different osazone

Question 7

Hydrates of carbon

Polyhydroxy aldehydes or ketones

Polyhydroxy acid compounds

None of these

Question 8

Glycerine

Stearic acid

Glucose

Adenine

Question 9

Uracil

2-aminopyridine

Thymine

Adenine

Question 10

Vitamin

Enzyme

Protein

Carbohydrate

User

Question Analysis

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.