The reason for double helical of DNA is operation of ?

Dipole-dipole interaction

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Hydrogen bonding

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Electrostatic attractions

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Van der waal’s forces

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Solution

The correct option is B Hydrogen bonding
Theory based question

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Q. The reason for double helical structure of DNA is operation of

Q. The reason for double helical structure of DNA is the operation of:

Proteins are found to have two different types of secondary structures viz $α -$ helix and $β -$ pleated sheet structure. $α -$ helix structure of protein is stabilised by
(a) peptide bonds (b) van der Waals, forces
(c) hydrogen bonds (d) dipole-dipole interactions

Q. For the type of interactions:

(I)

Covalent bond,

(I I)

van der waal's forces,

(I I I)

Hydrogen bonding,

(I V)

Dipole-dipole interaction, which represents the correct order of increasing stability?

Q. Identify the correct combination from the following:

	Column I	Column II
A	Hydrogen	Hydrogen bonding
B	Hydrogen iodide	Dipole-dipole forces
C	Ammonia	Hydrogen bonding
D	Mercury	Vander waals forces
E	Magnesium oxide	Dipole-dipole forces

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The reason for double helical of DNA is operation of ?

The correct option is B Hydrogen bondingTheory based question

The correct option is B Hydrogen bonding
Theory based question