The authors use the word -backbone- in lines 3 and 39 to indicate thatOnly very long chains of DNA can be taken from an organisms with a spinal columnThe main structure of a chain in a DNA molecule is composed of repeating unitsA chain in a DNA molecule consists entirely of phosphate or of sugarsNitrogenous bases form the main structural unit of DNA

Question

Toppr Admin · Accepted Answer

The author of the passage explains the structure of DNA in detail- The term -apos-backbone-apos- used in line 3 and 39 explains that the molecule is a very long chain which consists of a regular alternation of sugar and phosphate groups-xA0-Thus- option B is the correct answer-xA0-

The author of the passage explains the structure of DNA in detail. The term 'backbone' used in line 3 and 39 explains that the molecule is a very long chain which consists of a regular alternation of sugar and phosphate groups. Thus, option B is the correct answer.

The author of the passage explains the structure of DNA in detail. The term 'backbone' used in line 3 and 39 explains that the molecule is a very long chain which consists of a regular alternation of sugar and phosphate groups.
Thus, option B is the correct answer.