Bacteriophage e.g. Bacteriophage lambda which infects the bacterial species Escherichia coli (E.coli), Retrovirus e.g. HIV (Human Immunodeficiency Virus) which infects helper T cells (immune cells), Reverse transcriptase enzyme - converts RNA into DNA, which can then be transcribed by the host cell, RNA, Double stranded DNA genome contained within capsid head, Attachment proteins - allow virus to bind to a host cell before infecting it, Capsid - protein coat, Lipid envelope, Nucleic acid - genetic material, Tail - consists of proteins that contract, allowing the virus to move the tail through the bacterial cell wall, Tail fibres - enable it to attach itself to its host and insert its DNA into the cell.

Viruses

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