Home
Class 11
BIOLOGY
Assterion : Each enzyme has a substrate ...

Assterion : Each enzyme has a substrate binding site in its molecule which forms highly reactive enzyme-substrate complex.
Reason : The enzyme-substrate complex is long-lived and dissociates into its product and unchanged enzyme.

A

Both Assertion and Reason is true and the Reason are the correct explanation of Assertion

B

Both the Assertion and the Reason are correct and the Reason is the incorrect explanation of the Aassertion

C

Assertion is true but the Reason is false

D

Both Assertion and Reason are false

Text Solution

Verified by Experts

The correct Answer is:
C
A particular substrate molecule is acted upon by a particular enzyme . After coming with the active site (a pocket into which the substrate fits) of the enzyme, the substrate molecules or reactants form a complex called enzyme-substrate complex. The enzyme substrate complex is short lived. In the complexed state, the molecules of the substrate undergo chemical change. The products remain attached to the enzyme for some time so that an enzyme-product complex is also formed. However, the products are soon released and the freed enzyme is able to bind more substrate molecules.
Promotional Banner

Similar Questions

Explore conceptually related problems

The inhibitor which does not resemble the substrate in structure and binds to the enzyme at site other than the active site is called

A particular enzyme molecule interacts with a specific substrate molecule is: explained by

The inhibitor which closely resembles the substrate in its molecular structure and inhibits the enzyme activity by biniding to the active site of the enzyme is called

Answer the following in one word only. Enzyme which becomes functional in the presence of its substrate.

Correct the statements if required by changing the underlined words: Constitutive gene synthesizes enzyme in the presence of its substrate.

Study the given data and answer the questions that follow. A sample of an enzyme called lactase was isolated from the intestinal lining of a calf. Assays were undertaken to evaluate the activity of the enzyme sample. The substrate of lactase is the disaccharide lactose. Lactase breaks a lactose molecule in two, producing a glucose molecule and a galactose molecule. Two assays were carried out. {:("Lactose concentration (% w/v)",15,15,15,15,15,15),("Concentration of enzyme smaple (%v/v)",0,5,10,15,20,25),("Reaction rate "mu"mole glucose "sec^(-1)mL^(-1),0,25,50,75,100,125):} {:("Lactose concentration (% w/v)",0,5,10,15,25,30),("Concentration of enzyme smaple (%v/v)",5,5,5,5,5,5),("Reaction rate "mu"mole glucose "sec^(-1)mL^(-1),0,15,25,35,40,40):} What are the variables in each of the two assays ?

Study the given data and answer the questions that follow. A sample of an enzyme called lactase was isolated from the intestinal lining of a calf. Assays were undertaken to evaluate the activity of the enzyme sample. The substrate of lactase is the disaccharide lactose. Lactase breaks a lactose molecule in two, producing a glucose molecule and a galactose molecule. Two assays were carried out. {:("Lactose concentration (% w/v)",15,15,15,15,15,15),("Concentration of enzyme smaple (%v/v)",0,5,10,15,20,25),("Reaction rate "mu"mole glucose "sec^(-1)mL^(-1),0,25,50,75,100,125):} {:("Lactose concentration (% w/v)",0,5,10,15,25,30),("Concentration of enzyme smaple (%v/v)",5,5,5,5,5,5),("Reaction rate "mu"mole glucose "sec^(-1)mL^(-1),0,15,25,35,40,40):} Which of the following statements can be concluded from the two assays ?

Study the given data and answer the questions that follow. A sample of an enzyme called lactase was isolated from the intestinal lining of a calf. Assays were undertaken to evaluate the activity of the enzyme sample. The substrate of lactase is the disaccharide lactose. Lactase breaks a lactose molecule in two, producing a glucose molecule and a galactose molecule. Two assays were carried out. {:("Lactose concentration (% w/v)",15,15,15,15,15,15),("Concentration of enzyme smaple (%v/v)",0,5,10,15,20,25),("Reaction rate "mu"mole glucose "sec^(-1)mL^(-1),0,25,50,75,100,125):} {:("Lactose concentration (% w/v)",0,5,10,15,25,30),("Concentration of enzyme smaple (%v/v)",5,5,5,5,5,5),("Reaction rate "mu"mole glucose "sec^(-1)mL^(-1),0,15,25,35,40,40):} Which of the following assays would you expect to have the highest reaction rate ?

Refer to the given graph showing relationship between temperature and enzyme action. Select the correct statement regarding 'A' and 'B'. (i) 'A' shows the rate at which reaction decreases due to denaturation of enzyme molecules. (ii) 'B' shows rate at which reaction increases due to decreased kinetic energy of substrate. (iii) As temperature rises, more and more enzyme molecules are denatured and 'A' appears to fall. (iv) 'B' shows rate at which reaction increases due to increased kinetic energy of substrate and enzyme molecules.

Assertion : The inhibition of activity of succinic dehydrogenase by malonate which closely resembles the substrate succinate in structure is the example of competitive inbhibition. Reason : Competitive inhibition is the inhibition of enzyme activity when inhibitor closely resembles the substrate, in its molecular structre.