Virus, Virion, Viroids, Virusoids, Prions, Difference between plant and animal virus. 

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The virion represents a virus in its extracellular phase of the host, whereas virus is a broad general term for any aspect of the infectious agent which can act as an obligate intracellular parasite.
 The difference between virus and virion is that, viruses are intracellular obligatory parasites whereas virions reside extracellular.
Virus
Virus Discovery and Definition • Virus Discovery/Histor...
General Structure of Virus • Virus General Structur...
Virion, Viroids, Virusoids, Prions • Virus, Virion, Viroids...
Tobacco Mosaic Virus • Tobacco Mosaic Virus (...
Bacteriophage • Bacteriophage; Discove...
Bacteria
Bacteria General character • Bacteria #Introduction...
Asexual reproduction in Bacteria • Asexual Reproduction i...
Genetic recombination in Bacteria • Conjugation, transform...
Algae
General character of algae 1 • Algae General characte...
General character of algae 2 • Algae General characte...
Criteria of algal classification • Criteria of algal clas...
Oedogonium Structure • Oedogonium Part I Thal...
Oedogonium Reproduction • Oedogonium Part II Rep...
Batrachospermum structure • Batrachospermum Part I...
Batrachospermum reproduction • Batrachospermum Part I...
Lichen
Lichens • Lichens structure and ...
Economic importance of lichen • Economic Importance of...
Fungi
General character of fungi • Fungi general characte...
Agaricus • Agaricus Mushroom, Veg...
Alternaria • Alternaria solani life...
Morchella • Morchella or Morels or...
Rhizopus • Rhizopus life cycle, v...
Taxonomy
Numerical Taxonomy • Numerical taxonomy & O...
Anatomy
Simple and permanent tissue • Simple tissues (Types ...
Dicot and monocot stem • Dicot stem and Monocot...
Dicot and monocot root • Dicot & Monocot Root
Dicot and monocot leaf • Dicot & monocot leaf.
Plant biotechnology
Plant tissue culture • Plant Tissue Culture, ...
Gene transfer techniques in plants • Gene Transfer Methods ...
Transposons • Transposons/Jumping ge...
Ti & Ri plasmid • Ti & Ri plasmid #plasm...
Golden Rice • Golden rice,#goldenric...
Germplasm conservation • Germplasm conservation...
Restrictions enzymes • Restriction Enzymes #...
Somaclonal variations • Somaclonal variation: ...
Chloroplast • Chloroplast Structure ...