Question : When an apple is cut, it gets discoloured due to the presence of the enzyme:
Option 1: carbonic anhydrase
Option 2: nitrate reductase
Option 3: pyruvate kinase
Option 4: polyphenol oxidase
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Correct Answer: polyphenol oxidase
Solution : The correct option is polyphenol oxidase.
Discolouration of cut apples is primarily due to the presence of an enzyme called polyphenol oxidase (PPO). When an apple is cut or damaged, the enzyme comes into contact with oxygen in the air. This exposure to oxygen triggers a series of chemical reactions that result in the formation of brown pigments known as melanins. This process is often referred to as enzymatic browning.
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Question : Select the most appropriate option to substitute the blank in the given sentence. If there is no need to substitute it, select 'No substitution required'. He peeled________ apple and cut it into slices.
Option 1: No substitution required
Option 2: Both a and an
Option 3: an
Option 4: a
Question : Which of the following is an enzyme that works as a meat tenderiser?
Option 1: Papain
Option 2: Lipases
Option 3: Amylase
Option 4: Glucose
Question : The enzyme that coagulates milk into curd is:
Option 1: rennin
Option 2: pepsin
Option 3: resin
Option 4: citrate
Question : Due to the presence of which of the following, there is a difference between animal cells and plant cells?
Option 1: Ribosomes
Option 2: Cell wall
Option 3: Chloroplast
Option 4: Protoplasm
Question : Select the most appropriate meaning of the given idiom. The apple of someone's eyes
Option 1: the apple that is rotten and irritating one's eyes
Option 2: the person that someone loves and is proud of
Option 3: the special apple that someone has bought
Option 4: the apple a day that keeps the doctor away
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