Question

The twisted ladder-like structure of a double-stranded DNA is also called?

Answer 1

Hint: The twisted ladder-like structure is called a helix and there are two helices in a DNA. It is the genetic material that carries hereditary information from generation to generation.

Complete answer:
The structure of DNA was described by two scientists – Watson and Crick. They received the Nobel Prize for this discovery.
Before them, another Scientist named Rosalind Franklin made a study on the structure of DNA. Based on her study, Watson-Crick described the double helix model of DNA.
DNA has an antiparallel double-helical structure.
One strand of the helix is from 3’ to 5’ and another helix is from 5’ to 3’.
The DNA is made up of deoxyribose sugar which is a five-carbon sugar.
DNA also has nitrogenous bases. These nitrogenous bases are of two types – purine and pyrimidine.
Purine is made up of adenine (A) and guanine (G).
Pyrimidine is made up of cytosine (C) and thymine (T).
A and T make two hydrogen bonds between them and G and C make three hydrogen bonds between them.
There is a phosphate group present in the DNA. The phosphate group has a negative charge. Thus, the charge of DNA is negative.
The sugar, nitrogenous base, and the phosphate group is called a nucleotide.
The sugar and nitrogenous base except the phosphate group is called nucleoside.
DNA is the genetic material that carries hereditary information from one generation to another.
Uracil (U) is a pyrimidine base that is seen in the RNA.

Note: The DNA is the hereditary molecule that can replicate and make its own copy by the replication process and it also makes RNA by transcription process.