Which of the following element is not present in all proteins ?
Correct answer: A. S
- A. S
- B. C
- C. N
- D. O
Explanation
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
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Proteins are classified by shape, composition and structure, from primary amino acid sequence to secondary, tertiary and quaternary organisation, and their biological roles are linked to this structure. Enzymes are examined as protein biocatalysts, including active sites, substrate specificity, activation energy, cofactors and factors affecting activity.
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