Where is chitin primarily found?

Chitin is primarily found in the exoskeletons of arthropods, such as crabs and lobsters. This complex carbohydrate contributes to the structural integrity and protection of these organisms. Chitin serves a similar function to cellulose in plants but is unique to certain animals, fungi, and some algae. Its presence in the shells of crabs and lobsters is crucial for maintaining their shape and providing a defense against predators.

While plant cell walls are composed primarily of cellulose, and cytoplasm in plant cells contains various organelles and substances that support cellular function, chitin does not play a role in these structures. Animal blood does not contain chitin, as it primarily consists of plasma and blood cells, which do not utilize chitin for structure or function. Thus, the association of chitin with the exoskeletons of crabs and lobsters is distinct and accurate.