Tag: Cell wall composition

As the best-studied Gram-positive bacterium, *Bacillus subtilis* is a fascinating model organism for cellular research. This rod-shaped microbe, commonly found in soil, is a complex organism composed of a robust cell wall, a specialized cytoplasmic membrane, and intricate internal structures. Its specific composition allows it to thrive in varied environments and form highly resilient endospores under stress.

Cellulose is the most abundant organic polymer on Earth, making up the primary structure of plant cell walls. Despite this ubiquity, humans cannot digest pure cellulose, which is why it is an important component of insoluble dietary fiber. This inherent indigestibility is the key distinction in the relationship between cellulose and fiber.