Q64 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 : Deoxyribose, C5H10O4 is not a carbohydrate.


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


A carbohydrate is a biomolecule consisting of carbon, oxygen and hydrogen atoms. Deoxyribose is therefore a 5 carbon carbohydrate molecule that forms the phosphate backbone of DNA molecule. Carbohydrates, which are polyhydroxy aldehyde or polyhydroxy ketone, on hydrolysis, yields these simple molecules.

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62

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 : β-glycosidic linkage is present in maltose,



Reason : Maltose is composed of two glucose units in which C–1 of one glucose unit is linked to C–4 of another glucose unit.


 63

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 : All naturally occurring a-aminoacids except glycine are optically active.


Reason : Most naturally occurring amino acids have L-configuration.


 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.


 66

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.