Q. Consider the following statements:
1.Enzymes are a type of proteins which catalyse reactions in a cell.
2.Coenzymes are the organic molecules that support the activities of an enzyme.
3.Ubiquinone is a water-solvent coenzyme which works as an antioxidant.
How many of the above statements are correct?
Answer: B
Notes:
Explanation: Statements 1 and 2 are correct
Statement 1 is correct: Enzymes are proteins that catalyse reactions in a cell, making metabolism efficient.
Statement 2 is correct: Coenzymes are naturally occurring organic molecules that bind to and support the activity of enzymes.
Statement 3 is incorrect: Ubiquinone (a coenzyme) is a molecule containing several isoprene units which are antioxidants and offer stability against stress. Ubiquinone is present in every cell membrane and crucial for energy production. It comes in 10 different types (CoQ1…Q10). Each one of them is a molecule in the respiratory chain as a water-insoluble, but lipid-soluble antioxidant.
Source: TH
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