Aliphatic hydrocarbons  a major subgroup of the saturated hydrocarbons 
Aromatic hydrocarbons a major subgroup of the unsaturated hydrocarbons 
means "must have", not "oblong", though can exist outside host, needs host to reproduce 
Saturated having only single covalent bonds. Note that all diagrams in Fig. 15.1 to 15.5 are unsaturated. 
Unsaturated  having multiple bonds 
Virus an obligate, intracellular parasite. i.e. needs a host to reproduce, gets inside cell (often inside nucleus) 
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