A Level Biology Practice Exam

How does the orientation of beta glucose molecules in cellulose affect its structure?

1. It allows cellulose to coil easily

2. It forms strong and insoluble fibers

3. It makes cellulose soluble in water

4. It prevents hydrogen bonding

The correct answer is: It forms strong and insoluble fibers

The orientation of beta glucose molecules in cellulose is key to its structural properties, leading to the formation of strong and insoluble fibers. In cellulose, the beta glucose molecules are oriented such that they alternate their positions, allowing the long chains to lie straight and align closely together. This arrangement facilitates extensive hydrogen bonding between adjacent chains, enhancing the strength and stability of the overall structure. These strong hydrogen bonds contribute to the rigidity of the cellulose fibers, making cellulose resilient and able to provide structural support in plants. This structural characteristic is fundamental to cellulose's role in plant cell walls, where it contributes to the overall integrity and durability of plant tissues.