Question

In DNA molecule two polynucleotide chains are
different in
(1) Number of purine and pyrimidine bases
(2) Polarity
(3) Molecular weight
(4) More than one option is correct​

Answer 1

Answer:

polarity

Explanation:

one is from 5 - 3 and other is from 3-5

so they are different in polarity

Answer 2

In DNA molecule two polynucleotide chains are different in (2) Polarity.

DNA or Deoxyribonucleic Acid - It is a group of nucleotides that are made up of deoxyribose sugar, a nitrogenous base and a phosphate group. DNA acts as a vehicle for the transport of genes from generation to generation.

Properties of Double-helix DNA:

• Composition: DNA is a group of polynucleotides where sugar-phosphate make the backbone and the nitrogenous bases point inwards.
• Polarity: The two DNA strands run anti-parallel to each other which is the 5' end of one strand faces the 3' end of the other strand.
• Pairing of bases: The two strands of DNA are joined through hydrogen bonds that form between the nitrogenous bases.

DNA is more stable as compared to RNA and is hence used for the storage of genetic material inside the cell.