First slide

Proteins

Question

A certain compound gives negative test with ninhydrin and positive test with Benedict's solution, the compound is:

Moderate

A

a protein
B

a lipid
C

a monosaccharide
D

an amino acid

Solution

A monosaccharide gives positive test with Benedict solution and negative test with ninhydrin. Since, unknown compound gives a negative test with ninhydrin, it cannot be a protein or an amino acid. Since, it gives a positive test with Benedict's solution, it must be a monosaccharide but not a lipid.

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