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.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
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.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Carboxylic Acids questions
The solution of which acid is used for seasoning of food:
Which reagent is used to reduce a carboxylic group to an alcohol:
Which of the following derivative can't be prepared directly from acetic acid:
Which of the following will react with both ethanol and ethanoic acid at room temperature:
Which one of the following metal can evolve hydrogen from acetic acid:
Which one of the following is not a dicarboxylic acid: