Viruses are small obligate intracellular parasites, which by definition contain either a RNA or DNA genome surrounded by a protective, virus-coded protein coat.

Feb 2, 2023 · What are viruses: learn what they look like, their characteristics, parts and structure described using a simple labelled picture, and how they reproduce

Oct 13, 2025 · Virus, infectious agent of small size and simple composition that can multiply only in living cells of animals, plants, or bacteria. Viruses possess unique infective properties and …

May 16, 2021 · A virus is a submicroscopic infectious agent that can only replicate inside living cells of organisms. Viruses infect all forms of life—animals, plants, fungi, bacteria, and even …

When a single virus is in its complete form and has reached full infectivity outside of the cell, it is known as a virion. A virus structure can be one of the following: icosahedral, enveloped, …

This article introduces the composition of virus including viral genome structure, capsid structure, envelope structure and function, virus-like particles, tools for virus structure research and virus …

Most viruses have icosahedral or helical capsid structure, although a few have complex virion architecture. An icosahedron is a geometric shape with 20 sides, each composed of an …

Apr 12, 2025 · Despite their microscopic size, viruses are surprisingly sophisticated in structure. At their core lies their genetic material—either DNA or RNA, but never both—housed inside a …

Dec 16, 2024 · Learn about virus structure for your IB HL Biology course. Find information on viral components, structural diversity and examples like HIV and coronaviruses.

They vary in shape. The two main classes are RNA viruses and DNA viruses. Outside of a living cell, a virus is an inactive particle, but within an appropriate host cell it becomes active, …