Question

A, B and C are three biomolecules. The results of the tests performed on them are given below :
$\begin{array}{cccc}& \text{Molisch’s Test}& \text{Barfoed Test}& \text{Biuret Test}\\ \text{A}& \text{Positive}& \text{Negative}& \text{Negative}\\ \text{B}& \text{Positive}& \text{Positive}& \text{Negative}\\ \text{C}& \text{Negative}& \text{Negative}& \text{Positive}\end{array}$

A, B and C are respectively

• A. A=Lactose, B=Glucose, C=Albumin
• B. A=Lactose, B=Glucose, C=Alanine
• C. A=Lactose, B=Fructose, C=Alanine
• D. A=Glucose, B=Fructose, C=Albumin

Answer 1

The correct option is A A=Lactose, B=Glucose, C=Albumin

Lactose, glucose and fructose gives positive Molisch’s test.
Glucose gives positive Barfoed’s test whereas sucrose gives a negative for Barfoed’s test.
Albumin gives positive for Biuret test whereas alanine gives a negative Biuret test.