NEET BIOLOGY

Detailed explanation-1: -Obligate intracellular parasites cannot reproduce outside their host cell, which means that the parasite’s reproduction is entirely reliant on intracellular resources.

Detailed explanation-2: -An organism that can not complete its life cycle without its host is called obligate parasite. They cannot live without host. A facultative parasite is an organism that may resort to parasitic activity, but does not absolutely rely on any host for completion of its life cycle.

Detailed explanation-3: -Viruses are small obligate intracellular parasites, which by definition contain either a RNA or DNA genome surrounded by a protective, virus-coded protein coat. Viruses may be viewed as mobile genetic elements, most probably of cellular origin and characterized by a long co-evolution of virus and host.

Detailed explanation-4: -Intracellular parasites (e.g. toxoplasma, plasmodia, etc.) reside within specialized membrane surrounded vacuoles named parasitophorous vacuoles. Therefore, these intracellular parasites are cut off from vesicular membrane traffic within the host cells.