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Because HIV is a virus. Viruses have spikes because it is their way of reproducing.
They are not spikes - they are arms. They use these 'arms' to catch other cells to mutate them or eat them.
Spikes are proteins that are part of the viral capsid/envelope (depending on if the virus is a naked virus or not). It helps with attachment to the host cell. They are derived from their host cell's own proteins (but are not the same as their hosts), and can help in evading the host cell's defenses.
The function of spike proteins is to imitate a protein your cells take in to allow the virus access to the nucleus.
To protect the sponge's body.
Lysogenic virus.
endocytosis
A virus that uses both boot-sector and executable functions is a multipartite virus. This type of virus attacks a variety of platforms, and continually re-infects each platform until it is removed.
The virus's genetic material.
A virus the immediately takes over a cell's functions is an active virus. An active virus causes the host cell to make new viruses, destroying the host cell.
BIOS virus detection functions
because they can't carry out functions