Home
Class 12
BIOLOGY
Substrate concentration at which an enzy...

Substrate concentration at which an enzyme attains half its maximum velocity is

A

Threshold value

B

Half-life

C

Michaelis-Menten constant

D

Concentration coefficient.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the substrate concentration at which an enzyme attains half its maximum velocity, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Question**: The question asks for the substrate concentration at which an enzyme reaches half of its maximum velocity (Vmax). 2. **Define Key Terms**: - **Enzyme**: A biological catalyst that speeds up chemical reactions. - **Vmax**: The maximum rate of an enzyme-catalyzed reaction when the enzyme is saturated with substrate. - **Michaelis-Menten Constant (KM)**: A key parameter in enzyme kinetics that represents the substrate concentration at which the reaction velocity is half of Vmax. 3. **Relate Vmax and KM**: According to the Michaelis-Menten equation, when the substrate concentration is equal to KM, the reaction velocity (V) is half of Vmax. This means that at this concentration, half of the enzyme active sites are occupied by the substrate. 4. **Evaluate the Options**: - **Threshold Value**: Incorrect, as it refers to a minimum value for a reaction to occur. - **Half-Life**: Incorrect, as it relates to the time taken for a substance to reduce to half its initial quantity. - **Concentration Coefficient**: Incorrect, as it does not pertain to enzyme kinetics. - **Michaelis-Menten Constant (KM)**: Correct, as it is defined as the substrate concentration at which the reaction velocity is half of Vmax. 5. **Conclusion**: The substrate concentration at which an enzyme attains half its maximum velocity is the Michaelis-Menten constant, denoted as KM. ### Final Answer: The correct answer is **Michaelis-Menten constant (KM)**. ---
Promotional Banner

Topper's Solved these Questions

  • MOLECULES OF THE CELL

    DINESH PUBLICATION ENGLISH|Exercise RQ|649 Videos

  • MOLECULES OF THE CELL

    DINESH PUBLICATION ENGLISH|Exercise CYG|43 Videos

  • MICROBES IN HUMAN WELFARE

    DINESH PUBLICATION ENGLISH|Exercise Brain Teasers-VIII|60 Videos

  • MOLLUSCA

    DINESH PUBLICATION ENGLISH|Exercise CYG|10 Videos

Similar Questions

Explore conceptually related problems

The substrate concentration at which the chemical reaction catalyzed by an enzyme attains half of its maximum velocity is termed as

With the increase is substrate concentration the rate of enzymatic activity increases

Among the statement given below, which statements /s is / are correct regarding the relationship between enzyme and substrate ? I. Above a certain concentration of substrate , an enzyme reaches its maximum rate of reaction II. Increasing the substrate concentration to a higher level doesn't reverse the effects of a competitive inhibitor. III At high substrate concentration , a non competitive inhibitor no longer affects the enzyme activity . IV. The higher the concentration of substrate the faster an enzyme can cataylse a reaction.

A particle oscillating in simple harmonic motion has amplitude 'a'. The distance from the mean position at which its velocity will be one half of the maximum velocity is

Figure given below shows three velocity-substrate concentration curves for an enzyme reaxtion. What do the curves for an enzyme reaction. What do the curves depict

The Given figure shows three velocity-substrate concentration curves of an enzyme reaction. What do the curves X Y and Z depict respectively ?

What is denoted by X and Y in the given graph? {:("X","Y"),("1) Activation energy without enzyme","Activation energy with enzyme"),("2) Activation energy with enzyme ","Activation energy without enzyme"),("3) Substrate concentration with enzyme","Substrate concentration without enzyme"),("4) Substrate concentration without enzyme","Substrate concentration with enzyme"):}

The velocity of enzymatic reaction increases with the ................. in substrate concentration up to a certain point until it approaches the maximum value.

Starting from rest, a fan takes five seconds to attain the maximum speed of 400 rpm (revolutions per minute). Assuming constant acceleration find the time taken by the fan in attaining half the maximum speed.

A particle starting from rest undergoes a rectilinear motion with acceleration a. The variation of a with time t is shown below. The maximum velocity attained by the particle during its motion is