Evolutionary Walls: Comparing Chitin vs Cellulose

If a molecule is made of many simple sugar units linked together in a long chain, then it is a polysaccharide. If both materials fit this chemical description, then the statement is true.

If wood is a plant product, then it must be made of plant cell walls. If plant cell walls are built from bundles of glucose, then the presence of those fibrous glucose chains identifies the sample as cellulose.

If cellulose is the "skeleton" that holds the plant up, then removing it takes away all structural support. If the support is gone, then the plant can no longer stand against gravity and will collapse.

If both are polysaccharides used to build strong barriers, then they share a purpose. If one is for plants and the other is for fungi/insects, then the best summary is that they are structural sugars used by different kingdoms.

If a material is meant to provide structure in rain or moist soil, then it cannot dissolve in water. If the chains of chitin or cellulose are bundled into tight, fibrous layers, then water cannot easily break them apart.

If we categorize life by kingdoms, then we see patterns in building materials. If cellulose is the hallmark of the Plant kingdom and chitin is the hallmark of the Fungi and Animal (Arthropod) kingdoms, then that is their main difference.

If a cell belongs to the plant kingdom, then it requires a rigid boundary to stand upright. If that boundary is built from glucose chains, then the material is cellulose.

If a material contains nitrogen and is used to make hard shells for crabs, then it is chemically very stable. If cellulose is easier for many bacteria and fungi to break down, then chitin is the tougher of the two.

If a cow eats grass, then it consumes a lot of cellulose. If the cow itself cannot break it down but has special bacteria that can, then the cow can eventually absorb the energy from that grass.

If plants and fungi are in different kingdoms, then they must have major differences. If plants use cellulose and perform photosynthesis while fungi use chitin and absorb nutrients, then they are not the same thing.

If an organism is a fungus, then it does not use the same building blocks as a plant. If a fungus builds a cell wall for protection, then it uses the nitrogen-containing sugar called chitin.

If an animal like a crab or a beetle needs a hard outer shell, then it must produce a tough structural material. If that material is the same one used by fungi, then the answer is chitin.

If you break down these complex structures into their smallest repeating parts, then you find sugar. If the specific sugar molecule used to build these long chains is glucose, then that is the common denominator.

If paper is made from trees and trees are plants, then paper is made of plant cell walls. If plant cell walls are made of cellulose, then the idea that paper is made of chitin is false.

If plants and fungi look similar but use different chemicals for their walls, then they evolved differently. If we study these two specific materials, then we can see why fungi are actually more closely related to animals than to plants.

If you look at the molecular components of these two sugars, then you will see they are very similar. However, if one has an added acetylamine group containing nitrogen, then that molecule is chitin.

If a cell wall exists, then its job is to keep the cell's form and protect the inside. If both chitin and cellulose form these walls, then they both provide support, protection, and shape. They are structural, not for energy storage.

If both are made by living things using carbon, then they are organic. If they both form walls or shells, then they are structural. If they are sugar-based, then they are carbohydrates. Animal cell membranes do not have these walls.

If an object is a plant or made from plant fibers, then it contains cellulose. If oak trees, grass, and cotton are all plant-based, then they contain cellulose. Mushrooms (fungi) and grasshoppers (animals) do not.

If the human body lacks the enzymes to break the specific bonds in cellulose, then it cannot be absorbed as sugar. If this undigested material helps move food through the gut, then it is called fiber.