Q66 of 71 Page 212

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion : In presence of enzyme, substrate molecule can be attacked by the reagent effectively.


Reason : Active sites of enzymes hold the substrate molecule in a suitable position.


Enzymes hold the active sites of the substrate molecule in such a way so that the reagent can attack the substrate site effectively. Stereospecificity is one of the main properties of enzyme catalyzed reactions.

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64

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion : Deoxyribose, C5H10O4 is not a carbohydrate.


Reason : Carbohydrates are hydrates of carbon so compounds which follow Cx(H2O)y formula are carbohydrates.


 65

Note : In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

Assertion : Glycine must be taken through diet.


Reason : It is an essential amino acid.


 67

Write the reactions of D-glucose which can’t be explained by its open-chain structure. How can cyclic structure of glucose explain these reactions?

 68

On the basis of which evidences D-glucose was assigned the following structure?