# What is the relationship between reaction velocity and substrate concentration?

## What is the relationship between reaction velocity and substrate concentration?

The rate of reaction when the enzyme is saturated with substrate is the maximum rate of reaction, Vmax. The relationship between rate of reaction and concentration of substrate depends on the affinity of the enzyme for its substrate.

### How does substrate concentration affect enzyme velocity?

The effect of substrate concentration on enzyme kinetics are as follows: The rate or velocity of the reaction increases initially with an increase in the substrate. As the reaction proceeds, at high concentrations of the substrates, the enzyme gets saturated with substrate molecules and the velocity decreases.

#### What effect did substrate concentration have on the initial rate of the enzyme concentration?

Initially, an increase in substrate concentration leads to an increase in the rate of an enzyme-catalyzed reaction. As the enzyme molecules become saturated with substrate, this increase in reaction rate levels off. The rate of an enzyme-catalyzed reaction increases with an increase in the concentration of an enzyme.

What would be the effect on the initial reaction velocity if the concentration of enzyme was reduced to 10%?

Since the substrate is present in excess, the reaction velocities remain unchanged. The reaction velocity at each substrate concentration will be reduced ten fold since there is less enzyme. The velocity will increase ten fold because there will be effectively ten times as much substrate.

What is initial reaction velocity?

Enzyme kinetics graph showing rate of reaction as a function of substrate concentration. This value, the amount of product produced per unit time at the start of the reaction, is called the initial velocity, or V 0 V_0 V0​V, start subscript, 0, end subscript, for that concentration.

## Why are initial velocities used to describe Michaelis-Menten kinetics?

This then aids in determining the rate as a function of a known concentration. So initial rates are used to determine rate laws because concentrations are known and the concentrations can be prepared such that the rates can be accurately measured so they’re not too fast or they’re not too slow.

### Does initial velocity change with enzyme concentration?

One of the important parameters affecting the rate of a reaction catalyzed by an enzyme is the substrate concentration, [S]. During enzyme substrate reaction, the initial velocity V0 gradually increases with increasing concentration of the substrate.

#### What is the effect of initial velocity if the substrate concentration is low?

The key factor which affects the rate of reaction catalyzed by an enzyme is the amount of substrate present [S], the effect of V0 (initial velocity). At comparatively low concentration of substrate, V0 increases linearly with an increase in substrate concentration [S]. this is known as 1st order kinetics.

Why does increasing substrate concentration increase enzyme?

Increasing Substrate Concentration increases the rate of reaction. This is because more substrate molecules will be colliding with enzyme molecules, so more product will be formed.

When the velocity of enzyme activity is plotted against substrate concentration it shows which curve?

Answer: When the velocity of enzyme activity is plotted against substrate concentration,the curve obtained is hyperbolic.

## What is the significance of Vmax?

Vmax is the maximal reaction rate or velocity of an enzymatically catalyzed reaction when the enzyme is saturated with its substrate. At a specified enzymatic concentration, temperature & pH, this maximal rate of reaction is the characteristic feature of a particular enzyme.

### What is the relationship between substrate concentration and initial rate or velocity?

As [S] is first increased, the initial rate or velocity (V 0)increases with increasing substrate concentration i. V is proportional to [S] B. As [S] increases, V increases less and less i. V is NOT proportional to [S] in this range C. Finally, V doesn’t increase anymore and velocity reaches its maximum (V max) i.

#### What is the maximum velocity of enzyme under substrate saturation?

However beyond a particular substrate concentration, the velocity remains constant without any further increase. This maximum velocity of an enzyme catalysed reaction under substrate saturation is called the V max , Maximum velocity.

What is initial initial velocity of an enzyme?

Initial velocity is the initial linear portion of the enzyme reaction when less than 10% of the substrate has been depleted or less than 10% of the product has formed. Initial velocity depends on enzyme and substrate concentration and is the region of the curve in which the velocity does not change with time.

What is the a substrate concentration used for?

A substrate concentration around or below the Kmis ideal for determination of competitive inhibitor activity. Kmis constant for a given enzyme and substrate, and can be used to compare enzymes from different sources.

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