
For the functioning of enzymes, which of the following statements is NOT correct?
A. An optimum temperature is needed
B. An optimum pH is needed.
C. They are substrate specific.
D. They always increase activation energy.
Answer
162k+ views
Hint: In our body, many biological reactions (chemical reaction in our body) take place and enzymes are the substances which help these reactions to proceed without any hindrance and quickly. Enzymes are used to catalyze reactions in the body or in short, enzymes are catalysts which catalyze reactions in the human body.
Complete Step by Step Answer:
All enzymes have active sites. As soon as enzyme get active, holoenzyme (if not activated, like apoenzyme) by the attack of non protein molecule (cofactor) on the protein part of enzyme (coenzyme), then, it attack on substrate and catalysis the reaction of that substrate.
For reaction, we need to supply energy to reactants and this energy should be greater than activation energy (minimum energy required to activate the reactants or start the reaction). Every reaction has its own activation energy, so, when a reaction has very high activation energy then it becomes difficult even to start the reaction. In that case, catalysts are used in the particular range of temperature and optimum pH value.
Catalyst (providing suitable surface) used to decrease the activation energy of any reaction and thus, help to increase the rate of formation of product or can say rate of forward reaction and also give good yield of major product. This is the same work of enzymes for biological reaction. Enzyme after activation attacks on substrate and accelerates the substrate to show reaction giving out suitable product. Enzymes always increase the rate of the reactions, decreasing the activation energy of the reaction.
Thus, the correct option is D as the enzyme does not increase the activation energy.
Note: It is important to note that every enzyme activates a specific reaction but not all or can say all reactions need a special enzyme to catalysis its reaction. Catalysts provide a suitable surface for reaction and decrease the activation energy of reaction to enhance the rate of forward reaction or backward reaction also in case of reversible reaction, remaining unaffected at the end of the reaction and released on the product side.
Complete Step by Step Answer:
All enzymes have active sites. As soon as enzyme get active, holoenzyme (if not activated, like apoenzyme) by the attack of non protein molecule (cofactor) on the protein part of enzyme (coenzyme), then, it attack on substrate and catalysis the reaction of that substrate.
For reaction, we need to supply energy to reactants and this energy should be greater than activation energy (minimum energy required to activate the reactants or start the reaction). Every reaction has its own activation energy, so, when a reaction has very high activation energy then it becomes difficult even to start the reaction. In that case, catalysts are used in the particular range of temperature and optimum pH value.
Catalyst (providing suitable surface) used to decrease the activation energy of any reaction and thus, help to increase the rate of formation of product or can say rate of forward reaction and also give good yield of major product. This is the same work of enzymes for biological reaction. Enzyme after activation attacks on substrate and accelerates the substrate to show reaction giving out suitable product. Enzymes always increase the rate of the reactions, decreasing the activation energy of the reaction.
Thus, the correct option is D as the enzyme does not increase the activation energy.
Note: It is important to note that every enzyme activates a specific reaction but not all or can say all reactions need a special enzyme to catalysis its reaction. Catalysts provide a suitable surface for reaction and decrease the activation energy of reaction to enhance the rate of forward reaction or backward reaction also in case of reversible reaction, remaining unaffected at the end of the reaction and released on the product side.
Recently Updated Pages
JEE Main 2021 July 25 Shift 1 Question Paper with Answer Key

JEE Main 2021 July 22 Shift 2 Question Paper with Answer Key

JEE Main Mock Test Series Class 12 Chemistry for FREE

Classification of Drugs Based on Pharmacological Effect, Drug Action

JEE Electricity and Magnetism Important Concepts and Tips for Exam Preparation

JEE Energetics Important Concepts and Tips for Exam Preparation

Trending doubts
JEE Main 2025 Session 2: Application Form (Out), Exam Dates (Released), Eligibility, & More

JEE Main 2025: Derivation of Equation of Trajectory in Physics

Displacement-Time Graph and Velocity-Time Graph for JEE

Types of Solutions

Degree of Dissociation and Its Formula With Solved Example for JEE

Electric Field Due to Uniformly Charged Ring for JEE Main 2025 - Formula and Derivation

Other Pages
NCERT Solutions for Class 12 Chemistry Chapter 1 Solutions

JEE Advanced Marks vs Ranks 2025: Understanding Category-wise Qualifying Marks and Previous Year Cut-offs

Solutions Class 12 Notes: CBSE Chemistry Chapter 1

NCERT Solutions for Class 12 Chemistry Chapter 6 Haloalkanes and Haloarenes

NCERT Solutions for Class 12 Chemistry Chapter 2 Electrochemistry

Electrochemistry Class 12 Notes: CBSE Chemistry Chapter 2
