Viruses differ in the shape of their capsids. Some capsid shapes include:
- Helical
- Icosahedral
- Complex

Capsid Shapes

A protein coat that surrounds the viral genome.

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Structures associated with Animal Viruses include: 

- Capsid
- Capsomer
- Viral lipid envelope
- Spike proteins

Animal Virus Structures

Structures of Bacteriophages include:

- Capsid
- Viral genome
- Sheath
- Tail fibers

Bacteriophage  Stuctures

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Capsid

Capsomer

A portion of the phospholipid membrane acquired through virion buds from a host cell.

Viral envelope

Viral spikes are protein structures that extend outward from the capsid on some naked and enveloped viruses. They function to attach the virus to host cells and determine the viral host range.

Viral Spikes

Connects the polyhedral head to the tail fibers and tail pins

Sheath

Helps with viral attachment to the receptors of the host cell surface for entry

Tail fibers/pins

Bacteriophage replication involves 2 types of life cycles: The Lytic Cycle and the Lysogenic Cycle.

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