help please QUESTION 12 When you chop an onion the vacuoles burst open releasing

Question

help please

QUESTION 12 When you chop an onion the vacuoles burst open releasing O a lachrymatory factor precursor that is then volatilized and oxidized to become activated causing us to cry b sulfenic acid precursor that reacts with the enzyme alliinase to make lachrymatory factor causing us to cry O C lachrymatory factor that reacts with sulfenic acid o d the enzyme allinase that then carries out the reaction to make lachrymatory factor that causes us to cry to make the tear-gas like substance that will cause us to cry

Explanation / Answer

Right answer is ‘b’

Mechanism: Onion cell vacuole (ballon like organs storing enzymes and osmotic solutions and minerals) filled with a allicin synthase enzyme (allinase) reacts with amino acid sulfoxides producing sulfenic acid which transforms into syn-propanethial S-oxide is very volatile and evaporates reaching eyes, lachrymal tears full of water + syn-propanethial S-oxide reaction produces sulfuric acid, which is the actual irritant for eyes, more acid induces lachrymal glands to produce more tears to wash off the acid formed in the eyes

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