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Biochemistry
Introduction to Biochemistry
Water and Mineral Salts
Carbohydrates
Lipids
Proteins
Enzymes
Nucleic Acids
Cell Biology
Cell Organization
Membranes
Cytoskeleton and Cell Movement
Cellular Digestion and Secretion
Cell Nucleus
Cell Division
Photosynthesis
Cellular Respiration
Protein Synthesis
Microbiology
Bacteria
Protists
Fungi
Virus
Zoology
Introduction to Taxonomy
Poriferans
Cnidarians
Platyhelminthes
Nematodes
Annelids
Molluscs
Arthropods
Echinoderms
Chordates
Fishes
Amphibians
Reptiles
Birds
Mammals
Physiology
General Histology
Blood
Metabolism and Nutrition
Digestion
Respiration
Circulation
Excretion
Skin and Coverings
Musculoskeletal System
Nervous System
Vision
Hearing and Balance
Endocrine System
Immune System
Gametogenesis
Reproduction
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View chapter-related images
virus structure viral life cycle retrovirus viral envelope bacteriophage viral crystallization
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Are the virus cellular beings?
Virus are considered living beings but they do not have cellular structure.
There are some controversy regarding the classification of virus as living beings. Their characteristics of self-reproduction and of having genetic material however reinforce that classification.
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What is the basic structure of virus?
Virus are constituted of genetic material (DNA or RNA) covered by a protein capsule also known as capsid. Some virus, like HIV, have in addition an external envelope derived from the plasma membrane of the host cell from which it came.
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Are there non-parasitic virus?
All virus are obligate intracellular parasites, i.e., they depend on the host cell to complete their life cycle. Virus do not have own metabolism.
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Embryology
General Embryology
Extraembryonic Membranes
Botany
Plant Classification and Life Cycles
Bryophytes
Pteridophytes
Gymnosperms
Angiosperms
Plant Tissues
Plant Physiology
Genetics
Fundamentals of Genetics
Mendel's Laws
Variations of Inheritance
Linkage and Crossing Over
Sex and Sex-Linked Inheritance
Blood Groups
Karyotype and Genetic Diseases
Genetic Distribution
Genetic Manipulation
Evolution
Hypothesis on the Origin of Life
Evolutionary Theory
Ecology
Notions on Ecology
Earth Biomes
Energy and Matter in Ecosystems
Biogeochemical Cycles
Biodiversity
Ecological Interactions
Ecological Succession
Populations
Environmental Problems
Diseases
Notions on Parasitism
Bacterial Infections
Protozoan Infections
Fungal Infections
Viral Infections
AIDS
Worm Infections
Prion Diseases
Degenerative Diseases
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