They play critical roles in how cells of these organisms grow and divide. (sciencedaily.com)
The team at the Department of Energy's Pacific Northwest National Laboratory glimpsed key chemical events, known as redox reactions, inside living cells of the organism. (sciencedaily.com)
Viruses are also not considered to be plants, since they do not have a cell of their own, but inhabit a host cell of another organism; moreover, in many classifications they are not considered a living organism at all. (eol.org)