JEE Main · 2019 · 11 Jan 2019 · Shift 2 · Biomolecules

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The correct match between Item I and Item II is

Item I
Item II
A. Ester test
P. Tyr
B. Carbylamine test
Q. Asp
C. Phthalein dye test
R. Ser
S. Lys

(A) $A - Q, B - S, C - P$ ✓ Correct
(B) $A - R, B - Q, C - P$
(C) $A - R, B - S, C - Q$
(D) $A - Q, B - S, C - R$

Answer: (A)

Solution

Match each test to the amino acid whose side chain answers it: the ester test responds to a free carboxyl group, pointing to aspartic acid (Asp); the carbylamine test responds to a primary amino group, pointing to lysine (Lys); and the phthalein dye test responds to a phenolic

-

OH, pointing to tyrosine (Tyr).

JEE Main · 2019 · 11 Jan 2019 · Shift 2 · Single correct option

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