Which of the following statements regarding viruses are correct?
(i) These are cellular, infectious, nucleoprotein particles.
(ii) They can be grown in culture medium.
(iii) Genetic material is either DNA or RNA, but never both.
(iv) They can be crystallised.

Options

A. i and ii
B. ii and iii
C. iii and iv
D. i,ii,iii and iv

Answer

C

Explanation

Viruses are non-cellular, infectious, nucleoprotein entiry that cannot be grown in culture medium as they lack their own machinery. Once they infect a cell, they take over the mechinery of the host cell to replicate themselves, killing the host.