How big are viruses?
The virus particles are 100 times
smaller than a single bacteria cell. The bacterial cell alone is more than 10
times smaller than a human cell and a human cell is 10 times smaller than the
diameter of a single human hair.
Are viruses alive?
Viruses by themselves are
not alive. They cannot grow or multiply on their own and need to enter a human
or animal cell and take over the cell to help them multiply. These viruses may
also infect bacterial cells.
The virus particle or the
virions attack the cell and take over its machinery to carry out their own life
processes of multiplication and growth. An infected cell will produce viral
particles instead of its usual products.
Structure of a virus
A virion (virus particle)
has three main parts:
·
Nucleic acid – this is
the core of the virus with the DNA
or RNA
(deoxyribonucleic acid and ribonucleic acid
respectively). The DNA or RNA holds all of the information for the virus and
that makes it unique and helps it multiply.
·
Protein Coat (capsid) –
This is covering over the nucleic acid that protects it
.
