Viruses, Viroids, AND Lichens

Tobacco Mosaic Virus

The ________ were found to be smaller than bacteria because they passed through bacteria- proof filters.

Diener

________ discovered a new infectious agent that was smaller than viruses and caused potato spindle tuber disease.

Viruses

________ cause diseases like mumps, small pox, herpes, AIDS and influenza.

Beijerinek

________ demonstrated that the extract of the infected plants of tobacco could cause infection in healthy plants and called the fluid as Contagium vivum fluidum.

mosaic formation

In plants, the symptoms can be ________, leaf rolling and curling, yellowing and vein clearing, dwarfing and stunted growth.

protein coat

The ________ called capsid made of small subunits called capsomeres, protects the nucleic acid.

Lichens

________ are very good pollution indicators- they do not grow in polluted areas.

algal component

The ________ is known as phycobiont and fungal component as mycobiont, which are autotrophic and heterotrophic, respectively.

Viruses

________ also contain genetic material, that could be either RNA or DNA but never both.

viruses

The ________ are non- cellular organisms that are characterised by having an inert crystalline structure outside the living cell.

Viruses

________ are nucleoprotein and the genetic material is infectious.

Viruses

________ that infect plants have single stranded RNA and ________ that infect animals have either single or double stranded RNA or double stranded DNA.

Lichens are very good pollution indicators

they do not grow in polluted areas