When we cut an onion, the synthase enzyme converts the amino acid sulfoxides of the onion into which acid?
Sulfenic acid
Correct Answer: Option 3 (Sulfenic acid)
Explanation:
The Process: Damage to the onion cells releases an enzyme called alliinase, which breaks down amino acid sulfoxides into sulfenic acids.
The Tears: Another enzyme, lachrymatory factor synthase, then converts the sulfenic acid into syn-propanethial-S-oxide—the gas responsible for making you cry.
Other Options: Nitric acid, citric acid, and sulfuric acid are not produced during this initial enzymatic breakdown of onion cells.
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