TO Diener (1971) discovered a new infections agent that was smaller than viruses

Consider the following statements about this infectious agent

I. It cause pototo spindle tuber disease

II. These are infectious RNA particles

III. It lacks the protein coat

IV. The molecular wt of its RNA is low

The above statements are assigned to

One of the following are very good pollution Indicator

AIDS in human is caused by

Which of the following can not be grown on artificial culture medium?

Term ‘virus’ means

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

Which one of the following viruses contains both DNA and RNA?

Which of the given feature is true about the viroids?

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

TMV and HIV are having

The RNA like particle, which causes disease is