Question

Each capsomere of TMV contains amino acids, whose number is
A.185
B.158
C.518
D.815

Answer 1

Hint: Viruses are non-cellular organisms as they have an inert crystalline structure outside the living cell. They enter the host cell and control the machinery for cell division to replicate themselves.
The protein coat of virus is called capsid and is made up of individual units called capsomeres.

Complete answer:
We know that viruses are so small and cannot be seen by naked eye. We need electron microscopes for visualising virus particles. Know that viruses are neither prokaryotes nor eukaryotes and they can’t be called living or non living.
Every virus contains a genetic material which is either a DNA or RNA. Know that both of them are not seen in a virus. Based on the genetic material, they are classified as DNA viruses and RNA viruses.
Some viruses like that of tobacco mosaic viruses (TMV) contain protein that covers the genetic material which is infectious in nature. This protein coat is called capsid and is made up of individual units called capsomeres. They are arranged either in helical or in polyhedral forms in the capsid.
Capsomeres in TMV have several amino acids. Each capsomere contains 158 amino acids.
TMV viruses are those viruses that cause mosaic disease in tobacco.
We can classify viruses mainly into three based on the type of organisms they infect. They are plant viruses, animal viruses and bacteriophages.

Hence the correct answer is OPTION(B)

Note: Viruses are inert outside the host cell. An inert virus is called viron. Know that they become active once they enter the host cell.
Bacteriophages are the viruses that infect bacterias. These have a major role in disease resistance shown by bacterias as viruses are capable to transfer disease resistant genes from one bacteria to the other.