Which of the following is NOT a characteristic of a virus?
Presence of genetic material
Ability to replicate inside a host cell
Independent metabolism
Non-cellular organization
Related Questions
Which one of the following is correctly matched?
National Institute of Virology – Pune
National Institute of Communicable Diseases – Lucknow
Central Drug Research Institute – Kasauli
National Institute of Nutrition – Mumbai
A virus differs from a bacterium as it contains
A cell wall
Cytosol
DNA as genetic material
DNA or RNA as genetic material with no ribosomes
Identify the correct pair of events when temperate phages infect bacteria. I. No prophages are formed
II. Bacterial cell undergoes many divisions.
III. Bacterial cell undergoes immediate lysis.
IV. Prophages are formed
The correct pair is
I and II
II and III
III and IV
II and IV
Select incorrect statement w.r.t. viruses.
Viruses can be cultured on artificial/synthetic medium
Viruses lack enzymes for protein synthesis
Viruses are obligate intracellular parasites
Viruses have either DNA or RNA as the genetic material
Which of the following phenomenon proves that viruses are living?
They carry metabolic activity
They carry anaerobic respiration
They multiply in host cells
They cause infection
Which of the following phenomenon proves that viruses are living?
They carry metabolic activity
They carry anaerobic respiration
They multiply in host cells
They cause infection
Which of the following statement is not true for retroviruses?
DNA is not present at any stage in the life cycle of retroviruses
Retroviruses carry gene for RNA dependent DNA polymerase
The genetic material in mature retroviruses is RNA
Retroviruses are causative agents for certain kinds of cancer in man
Analyse the following statements and identify the correct option given below.
I. Viruses that infects plants have single-stranded RNA and viruses that infects animals have either single or double-stranded RNA or double stranded DNA
II. Bacterial viruses or bacteriophase are usually single-stranded RNA viruses
Codes
Both I and II are correct
Only I is partially correct
Only II is correct
Neither I nor II are correct
I. DJ Ivanowsky (1892) recognised certain microbes as causal organisms of the mosaic disease of tobacco
II. MW Beijerinck (1898) demonstrated that the extract of infected plants of tobacco could cause infection in healthy plants and called the fluid as contagium vivum fluidum
III. WM Stanley (1935) showed that these microbes could be crystallised and crystals consist largely of protein
The above statements are assigned to
Bacteria
Virus
Prions
Lichens
Which is correct?
RNA is genetic material of bacteria
RNA is genetic material of all virus
DNA is genetic material of some organism
Some virus has RNA as genetic material
