JEE Main · 2019 · 09 Jan 2019 · Shift 2 · Biomolecules

The correct sequence of amino acids present in the tripeptide given below is

(A)Val - Ser - Thr✓ Correct
(B)Thr - Ser - Val
(C)Leu - Ser - Thr
(D)Thr - Ser - Leu

Answer: (A)

Solution

Read the tripeptide from the free

- NH X_{2}

end toward the free

- COOH

end. The first residue carries an isopropyl side chain,

- CH (CH X_{3}) X_{2}

, marking valine; the second has a

- CH X_{2} OH

side chain, which is serine; the third has

- CH (OH) CH X_{3}

, which is threonine. So the sequence is Val--Ser--Thr.

JEE Main · 2019 · 09 Jan 2019 · Shift 2 · Single correct option

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