Name: What Makes up Life?
Uploaded: 2019-07-19
Duration: 7 min 57 s
Description: Food makes us happy! But do you know food gives us something that literally 'makes' us? Can you guess what we are talking about? Learn through this video.

Question

Formation of enzyme-substrate complex

(E S)

is the first step in catalysed reactions. Describe the other steps till the formation of product.

Accepted Answer

An enzyme catalyses a reaction in order to hasten the rate of reaction. Thus, if under normal circumstances a particular number of units of product is formed one can get many times more units in the same time when the reaction is enzyme mediated.

An enzyme-mediated reaction can be broken into three main steps, which are as follows:
(a) Formation of enzyme-substrate complex $(E S)$
(b) Transient Stage
(c) Formation of Product

In the first step, the enzyme binds to the substrate at active site. This results in formation of enzyme-substrate complex.

Transient Phase: This is an altered structure state of the substrate. This is an unstable stage. Had there been no enzyme, the required activation energy would have been much higher. But because of the presence of enzyme, the reaction takes place with a less amount of energy.

Formation of Product: Once the transient phase is over, final product is formed. With this, the potential energy of the system also comes down drastically. This can be shown by the following graph. Once the product is formed, the enzyme becomes free to bind with another substrate.

NCERT Solutions for Chapter: Biomolecules, Exercise 4: LONG ANSWER TYPE QUESTIONS

NCERT Biology Solutions for Exercise - NCERT Solutions for Chapter: Biomolecules, Exercise 4: LONG ANSWER TYPE QUESTIONS

Questions from NCERT Solutions for Chapter: Biomolecules, Exercise 4: LONG ANSWER TYPE QUESTIONS with Hints & Solutions

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