✅ Quick Summary and Review

Term	Key Points
Virus	Non-cellular, infectious agent
Genome	DNA or RNA
Capsid	Protein coat
Envelope	Lipid layer from host (not in all viruses)
Nucleocapsid	Genome + Capsid
Bacteriophage	Virus that infects bacteria
T4 Phage	Infects E. coli, complex structure
HIV	Retrovirus, RNA genome, causes AIDS
Reverse Transcriptase	Enzyme that converts RNA → DNA

🎯 Final Mnemonic Review:

1. Virus Components — “Gives Cool New Energy”
   • Genome, Capsid, Nucleocapsid, Envelope
2. T4 Phage Parts — “Happy Tiny Insects Never Eat Tiny Food”
   • Head, Tail, Inner core, Neck, End plate, Tail fibres, Function
3. Retrovirus Process — “RDRP”
   • Retroviruses Do Reverse Process