591.

Assertion : Glycosides are hydrolysed in acidic conditions.

Reason : Glycosides are acetals.

• If both assertion and reason are true and the reason is the correct explanation of the assertion.

• If both assertion and reason are true and the reason is not the correct explanation of the assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion : Activity of an enzyme is pH dependent.

Reason : Change in pH affects the solubility of the enzyme in water.

• If both assertion and reason are true and the reason is the correct explanation of the assertion.

• If both assertion and reason are true and the reason is not the correct explanation of the assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion: DNA molecules and RNA molecules are found in the nucleus of a cell.
Reason: On heating, the enzymes do not lose their specific activity.

• If both assertion and reason are true and reason is a correct explanation of the assertion.

• If both the assertion and reason are true but the reason is not a correct explanation of the assertion.

• If the assertion is true but the reason is false.

• If both the assertion and reason are false.

The number of amino acids and number of peptide bonds in a linear tetrapeptide (made of different amino acids) are respectively

• 4 and 4

• 5 and 5

• 5 and 4

• 4 and 3

In DNA, the consecutive deoxynucleotides are connected via

• phosphodiester linkage

• phosphomonoester linkage

• phosphotriester linkage

• amide linkage

Which one is not a constituent of nucleic acid?

• Uracil

• Guanidine

• Phosphoric acid

• Ribose sugar

In aqueous solution glucose remains as:

• only in the open-chain form

• only in the pyranose form

• only in furanose form

• in all three forms in equilibrium

Vitamin C is

• citric acid

• lactic acid

• paracetamol 

• ascorbic acid

Which of the following contributes to the double helical structure of DNA ?

• Hydrogen bond

• Covalent bond

• Disulphide bond

• van der Waals' force

A tripeptide is written as glycine-alanine -glycine. The correct structure of the tripeptide is