Question

the ratio of capsomere : nucleotide in TMV is
1:3,3:1,1:2,2:1
​

Answer 1

The tobacco mosaic virus contains a genome of single-stranded RNA encased by 2,130 molecules of a single protein; there are 161/3 protein molecules for each turn of the RNA helix in the ratio of three nucleotides for each protein molecule.

Answer 2

• Each capsomere is a grape like structure containing about 158 amino acids and having a molecular weight of 17,000 dalton as determined by Knight.
• The ssRNA is little more in length (about 3300 Å) slightly protruding from one end of the rod.
• The RNA molecule consists of about 7300 nucleotides; the molecular weight of the RNA molecule being about 25,000 dalton. Correct option is. B. 2130.
• Depending on shape virus can be cylindrical or helical e.g., Tobacco Mosaic Virus (TMV) and cuboidal or polyhedral e.g., Adenovirus, Herpes virus.
• TMV contains a protein capsid, made up of capsomeres and single stranded RNA as genetic material.
• TMV has 2130 ovate capsomeres.