Question

In DNA hydrogen bond occurs between:
A) Phosphate and nitrogenous base
B) Sugar and phosphate group
C) Nitrogenous bases
D) Sugar and nitrogenous base

Answer 1

DNA is deoxyribonucleic acid. It is composed of two polynucleotide chain. The chains coil around each other to form a double helix. Each nucleotide is composed of one of four nitrogen containing nucleobases, a sugar which is called as deoxyribose and a phosphate group.

Complete Answer:

The two DNA strands are called polynucleotides.
The polynucleotides are composed of nucleotides.
The nucleotides are combined to one another in chains by covalent bonds.
The nitrogenous bases of two polynucleotide strands are bound together with hydrogen bonds to make double stranded DNA.
The nitrogenous bases are bound together according to the base pairing rules.
The nitrogenous bases are divided into two group pyrimidines and purines.
In DNA, the pyrimidines are thymine and cytosine.
In DNA, the purines are adenine and guanine.
Same biological information is stored by both strands of double stranded DNA.
The information of DNA is necessary to build and control the cell.

So the correct answer is Nitrogenous bases.

Note: Diffusion Pressure Deficit (DPD) is the pressure difference between pure water and solution. Osmotic pressure is required to be put to a solution to prevent the flow of its pure solvent whereas turgor pressure is the pressure inside a cell that moves the cell wall against plasma membrane. When a plant cell is kept in a hypotonic solution, the cell absorbs water through the process of osmosis and becomes fully turgid (no water can be absorbed). Cell membrane gets fully stretched and hence, osmotic pressure decreases and becomes equal to turgor pressure of the cell.