Chemistry · Macromolecules
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Which of the following element is not present in all proteins ?
- A
S
- B
C
- C
N
- D
O
Option A is correct since sulfur is present only in some proteins, not all.
The general formula for proteins is RCH(NH2)COOH implying that ALL the proteins at least contain C, H, N and O
A is correct since sulphur is present only in some proteins, not all. The general formula for proteins is RCH(NH2)COOH implying that ALL the proteins at least contain C, H, N and O
(C) Carbon – Incorrect: Carbon is a fundamental element in all organic molecules, including proteins. It forms the backbone of amino acids and peptide bonds.
(N) Nitrogen – Incorrect: All proteins contain nitrogen because amino acids, the building blocks of proteins, have an amino group (-NH₂) that contains nitrogen.
(O) Oxygen – Incorrect: Oxygen is present in all proteins as part of the carboxyl (-COOH) and amide (-CONH₂) groups in amino acids.
Tagged under Chemistry · Macromolecules · 2021