Viruses And Lichens (Biological classification) Flashcards
There is no mention of which acellular organisms in the five kingdom classification of Whittaker
Viruses
Viroids.
Prions. 
Viruses are ……… Organisms that are characterised by having and ……… Outside the living cell 
Non-cellular
Inert crystalline structure 
The word virus means
Venom or poisonous fluid 
Who recognised certain microbes as casual organisms of the mossiac disease of tobacco 
Dmitry Ivanovsky
Who demonstrated that the extract of infected plants of tobacco could cause infection and healthy plants and named the new pathogen virus and called the fluid as contagium vivum fluidum
MW Beijerinek
Who showed that viruses could be crystallised and crystals consisted largely of ….….
W.M.Stanley.
Proteins
Can viruses have both RNA and DNA as their genetic material? 
No viruses can have either RNA or DNA as their genetic material 
A virus is a ____ and the ____is infectious
Nucleoprotein
Genetic material 
In general viruses that infect plants have_______ ( genetic material)
Single-stranded RNA 
In general animal viruses have either___or____or____ (genetic material)
Single
Double-stranded RNA.
Double-stranded DNA. 
In general, bacterial virus is also known as____have ____(genetic material )
Bacteriophage
Double-stranded DNA
In viruses, the protein coat called___is made up of small subunits called____which protects the nucleic acid
Capsid
Capsomeres
Viruses cause diseases like
Mumps , smallpox, herpes, influenza, and AIDS 
In plants, the symptoms of virus infection can be
Mossiac formation leaf, rolling and curling, yellowing, and vein clearing, Dwarfing and stunted growth 
Viroids were discovered by
T.O. Diener 
Viroids, are ___than bacteria
Smaller 
Viroids causes which disease
Potato spindle tuber disease.
do viroids have a protein coat that is found in viruses?
No 
RNA of the viroid was of___Molecular weight
Low
Prions are associated with
 Infectious neurological diseases
Prions were found to be consisting of _____proteins and was____Size to virus
Abnormally folded.
Similar.
Prions or known to cause___disease in cows, and it’s analogous human variant____
Bovine spongiform encephalopathy BSE aka mad cow disease
CR – Jacob disease
Lichens are a symbiotic association between___and___
Fungi and algae
Algal component is known as___and fungal component is known as___which which are autotrophic and heterotrophic respectively
Phycobiont
Micobiont
Algae does what function in lichens?
Provides food for fungi
Fungus does what function in lichens?
Provides shelter and absorbs nutrients and water for its partner 
Lichens are very good____indicators –they ___in polluted areas 
Pollution
Don’t grow
