Final answer:
Infectious particles derive their membrane from the host cell's plasma membrane.
Step-by-step explanation:
Infectious particles, such as viruses, derive their membrane from the host cell's plasma membrane.
The viral envelope is obtained by budding from the cell's plasma membrane. During this process, a portion of the cell's membrane is incorporated into the viral envelope.
For example, enveloped viruses like influenza virus, HIV, and varicella zoster virus acquire an outer lipid bilayer known as a viral envelope from the host cell's membrane.