X in image represent substrate in this enzyme-substrate complex. Thus option A is correct.
What is enzyme-substrate complex?
In a chemical reaction, when the active site of an enzyme bind with the substrate wherein a substrate called enzyme-substrate complex.
The activity of an enzyme is depended on certain factors such as temperature, pH, co-factors, activators, and inhibitors.
when substrate is not attached to enzyme the shape of enzyme is different while the binding of substrate to the active site causes a conformational change of the enzyme.
The active site of an enzyme nothing but the area where substrate bind by forming weak bonds with enzyme.
The enzyme substrate complex is temporary, like substrate can be changed and one enzyme can bind with multiple number of substrates.
Further more, a beneficial mutation can also cause the changes in enzyme substrate complex which change effects the product.
Thus option A is correct.
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