Question

The viruses are known as
A. Unicellular
B. Acellular
C. Multicellular
D. Free genes

Answer 1

Hint: A virus is made up of a DNA or RNA genome inside a protein shell called a capsid. Some viruses have an external membrane envelope.

Complete answer: A virus is composed of a nucleus of genetic material, either DNA or RNA, surrounded by a protective surface called a protein-composed capsid. Often an extra spikey coat called the envelope covers the capsid. Viruses are capable of latching on and moving inside host cells.

When the freshly formed viral particle brushes against the plasma membrane of the host cell a portion of it adheres. The plasma membrane envelops the virus and forms the underlying cell. The virus discharges from the cell. This cycle uses up the cell membrane of the host gradually and typically leads to the death of cells.

                                             Fig. Virus


Particles of the virus break out into the extracellular space from the host cell, resulting in the host cell death. Once the virus has left the host cell it is free to enter and spread into a new cell.

So, the option (D) is correct

Note: Viruses are widely diverse. We come in various shapes and architectures, we have various genomes and they infect different hosts.
Viruses replicate by infecting their host cells and reprogramming them into "factories" which create viruses.