Which one of the following element is not present in all proteins:
Correct answer: D. Sulphur
- A. Carbon
- B. Hydrogen
- C. Nitrogen
- D. Sulphur
Explanation
While sulfur is commonly found in many proteins, not all proteins contain sulfur. Some proteins, particularly those with a high content of hydrophobic amino acids, may lack sulfur-containing amino acids such as cysteine and methionine. Therefore, option D is correct as sulfur is not universally present in all proteins.
Last updated
About Carboxylic Acids
Carboxylic acids are named and studied through the combined effects of the carbonyl and hydroxyl groups, their preparation, acidity and hydrogen bonding. Reactions include neutralisation, esterification, reduction and conversion into acid chlorides, anhydrides, esters and amides, with emphasis on how these derivatives interconvert.
Practise Carboxylic Acids
550 free Carboxylic Acids MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
2-hydroxy propanoic acid is also called _ ?
2CH3,COOH+xCa→ Ca (OCOCH3)2 +H2O. Calculate value of "x".
2CH3COOH+ xCa→ Ca (CH3COO)2 +H2.Calculate value of "x".
A carboxylic acid contains:
A compound has the properties below:it is a liquid at room temperature,it is immiscible with water,it does not decolourise acidified potassium manganate(VII).What could it be?