**Correct Option: C. Synthetic polymers can be engineered to have specific properties, such as flexibility or strength.** ### Detailed Explanation: **Why Option C is Correct:** Synthetic polymers are man-made materials created through the polymerization of monomers, which allows chemists to design and engineer them with specific properties tailored to various applications. This engineering capability means that synthetic polymers can be modified in terms of their molecular structure, which directly influences their physical and chemical properties. For example: - **Flexibility:** By altering the types of monomers used or the arrangement of the polymer chains, synthetic polymers can be made more flexible (like polyethylene) or more rigid (like polystyrene). - **Strength:** The addition of certain additives or the use of specific polymerization techniques can enhance the strength of synthetic polymers, making them suitable for applications in construction, automotive, and aerospace industries. This level of customization is a significant advantage of synthetic polymers over natural biopolymers, which are generally produced by living organisms and have less variability in their properties. ### Why the Other Options are Incorrect: **Option A: Synthetic polymers are always biodegradable.** - This statement is incorrect because most synthetic polymers, such as polyethylene and polystyrene, are not biodegradable. They can persist in the environment for hundreds of years. While there are biodegradable synthetic polymers (like polylactic acid), it is not accurate to say that all synthetic polymers are biodegradable. **Option B: Natural biopolymers have a more consistent molecular weight than synthetic polymers.** - This statement is misleading. Natural biopolymers, such as proteins and polysaccharides, can exhibit a range of molecular weights due to their complex structures and the variability in their biological synthesis. Synthetic polymers can also have a wide range of molecular weights, but they can be engineered to have a more uniform molecular weight through controlled polymerization techniques. Therefore, it is not universally true that natural biopolymers have a more consistent molecular weight. **Option D: Natural biopolymers are less diverse in their chemical structures than synthetic polymers.** - This statement is incorrect. Natural biopolymers, such as DNA, proteins, and cellulose, exhibit a vast diversity in their chemical structures due to the complexity of biological processes and the variety of functions they serve in living organisms. In contrast, while synthetic polymers can be diverse, they are often based on a limited set of monomers and may not match the structural complexity found in natural biopolymers. ### Summary of Key Points: - **Synthetic polymers can be engineered** for specific properties, making them versatile for various applications. - **Natural biopolymers** are not necessarily more consistent in molecular weight and can be highly diverse in structure. - **Not all synthetic polymers** are biodegradable; many persist in the environment. - **Natural biopolymers** exhibit a wide range of structures due to biological processes, often surpassing the diversity of synthetic options. This understanding of the differences between synthetic and natural polymers is crucial for applications in materials science, environmental science, and biochemistry.