The nucleic acid of a virus is surrounded by a protein coat called the capsid Each capsid is composed of protein subunits called capsomeres In some viruses, the capsid is covered by an envelope which usually consists of some combination of lipids proteins, and carbohydrates Depending on the virus envelopes may or may not be covered by spikes, which are carbohydrateprotein complexes that project from the surface of the envelope
The nucleic acid of a virus is surrounded by a protein coat called the capsid Each capsid is composed of protein subunits called capsomeres. In some viruses, the capsid is covered by an envelope, which usually consists of some combination of lipids, proteins, and carbohydrates. Depending on the virus, envelopes may or may not be covered by spikes, which are carbohydrateprotein complexes that project from the surface of the envelope
Structure of viruses Most viruses are too small to be seen under light microscope. All viruses consists of an RNA or DNA core genome surrounded by a protein coat capsid. The combined viral genome and capsid is called the nucleocapsid capsid Envelope Capsomeres Capsid cid Nuclei Capsid (composed of capsomeres Naked virus Enveloped virus
Structure of viruses • Most viruses are too small to be seen under light microscope. • All viruses consists of an RNA or DNA core genome surrounded by a protein coat capsid. • The combined viral genome and capsid is called the nucleocapsid
Complex viruses 65mm一 Capsid(head) Some viruses, particularly bacterial viruses, have very complicated structures and are called complex DNA viruses. Examples of complex viruses are poxviruses. which do not contain clearly identifiable capsids sheath but have several coats around the nucleic acid. Certain bacteriophages have capsids to which additional Endplate structures are attached Tail fibers
Some viruses, particularly bacterial viruses, have very complicated structures and are called complex viruses. Examples of complex viruses are poxviruses, which do not contain clearly identifiable capsids but have several coats around the nucleic acid. Certain bacteriophages have capsids to which additional structures are attached. Complex viruses
65mm Capsid(head DNA sheath Endplate Tail fibers A virus can have either dna or rna but never both !
A virus can have either DNA or RNA but never both !!
lai fiber A virus can have either dna or rna but never both !
A virus can have either DNA or RNA but never both !!