Question

1. Saturation of the rate of enzyme-catalyzed reactions occurs

		at high enzyme concentration
		at high substrate concentration
		at low substrate concentration
		by allosteric regulation

2. The induced fit is an improved model for enzyme function than the lock and key model because it considers

		considers the Gibbs free energy of the reaction
		considers specificity of the enzyme
		considers the catalytic activity
		considers the rate of reaction

Answer 1

1) the right answer is "at high substrate concentration"

2) the right answer is '"consideres specificity of the enzyme'"

Explation

2) The lock and key model proposed by Emil Fischer ,which proposed that the shape of the substrate and the the enzymes active site fit properly like key into a lock so that no need to change in the shape of the active sites. But induced fit model says that active site will change it's shape or confermational change in enzyme active site to proper fit of the substrate .This model explains the enzymes broad specificity.

1) An enzyme is saturated ,that means the substrate concentration reaches at the top. No active site is available to bind the substrate .Means and enzyme have number of active sites where specific substrate can bind but when the active site is full with the substrate and it begins to work then we call that the enzyme is fully saturated.