Which enzymes do not require co- enzymes for their activity ? Answer A. O The extracellular enzymes B. O The mitochondrial enzymes C. The intracellular enzymes D. O The Proenzymes
Answers
Answer:
answer A) O the extracellular enzymes
Explanation:
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Answer:
D. The Proenzyme
Proenzymes do not require the coenzyme for their activity.
Explanation:
Enzymes are biological molecules that perform catalytic reactions and enhance the rate of reaction. They are composed of proteins.
Coenzymes are non-protein molecules that assist the enzyme in biochemical reactions. These organic molecules bind to the active sites and accelerate the enzyme-catalysed reaction rate. The absence of a co-enzyme affects the rate of reaction. Example: Nicotinamide adenine dinucleotide
Proenzyme:
Proenzymes also called zymogens are functionally inactive. Certain biochemical changes activate the zymogens into an active enzyme. Example: Pepsinogen is a proenzyme secreted inside the stomach. Pepsinogen is inactive. It gets activated by the low pH of hydrochloric acid in the stomach. The acidic environment leads to the hydrolysis of pepsinogen into pepsin which is an active enzyme. Active pepsin catalyses protein digestion.
Extracellular Enzyme:
Enzyme synthesised and secreted outside the cell and it performs catalysis of biochemical reaction outside the cell. Example: Amylase.
Intracellular Enzyme:
Enzymes are synthesised within the cell and carry out enzyme reactions within the cell. Example: DNA Polymerase.
Mitochondrial Enzyme:
Enzymes embedded within the mitochondrial membrane. There are different enzyme complexes that need different co-enzyme and participate in the electron transport chain.
An enzyme with its co-enzyme is called a Holoenzyme and an enzyme without its co-enzyme is called an apoenzyme. Without the coenzyme, the enzyme may not work to optimum capacity.
So, a proenzyme is not an active enzyme and needs to be activated. Hence, it does not require a co-enzyme yet for its activity until it is activated.