Biological Classification Ques 128
128. Which statement is wrong for viruses?
[2012]
(a) All are parasitic
(b) All of them have helical symmetry
(c) They have the ability to synthesize nucleic acids and proteins
(d) Antibiotics have no effect on them
Show Answer
Answer : b
Hints & Solutions
(b) All the viruses are obligate parasites i.e. they remain inert outside the host cell. They have ability to synthesize nucleic acids and proteins by using host cellular machinery (ribosomes, tRNAs, amino acids, energy). Three shapes are found in viruses helical (elongate body e.g. T.M.V), cuboidal (short broad body with rhombic rounded, polyhedral shape e.g. Poliomyelitis virus) and icosahedral (with both cuboidal and helical parts e.g. many bacteriophages like $T_2$ ). Antibiotics have no effect on them, antiviral drugs cannot kill them.
BETA
