The ________ were found to be smaller than bacteria because they passed through bacteria- proof filters.
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Diener
________ discovered a new infectious agent that was smaller than viruses and caused potato spindle tuber disease.
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Viruses
________ cause diseases like mumps, small pox, herpes, AIDS and influenza.
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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.
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mosaic formation
In plants, the symptoms can be ________, leaf rolling and curling, yellowing and vein clearing, dwarfing and stunted growth.
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protein coat
The ________ called capsid made of small subunits called capsomeres, protects the nucleic acid.
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Lichens
________ are very good pollution indicators- they do not grow in polluted areas.
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algal component
The ________ is known as phycobiont and fungal component as mycobiont, which are autotrophic and heterotrophic, respectively.
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Viruses
________ also contain genetic material, that could be either RNA or DNA but never both.
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viruses
The ________ are non- cellular organisms that are characterised by having an inert crystalline structure outside the living cell.
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Viruses
________ are nucleoprotein and the genetic material is infectious.
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Viruses
________ that infect plants have single stranded RNA and ________ that infect animals have either single or double stranded RNA or double stranded DNA.
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Flashcard (61)