Yes, the Smith & Wesson M&P 15-22 is indeed constructed primarily from polymer. This design choice significantly reduces the rifle's overall weight compared to its all-metal counterparts, making it easier to handle, especially for those new to shooting or for sport shooting enthusiasts looking for a lightweight option. The use of polymer doesn't compromise the firearm's durability or functionality. It is a semi-automatic rifle chambered in .22 Long Rifle, making it a popular choice for recreational shooting, training, and even small game hunting due to its lower cost of ammunition and reduced recoil.

Amino acids are not enzymes but are the building blocks of proteins, including enzymes. Enzymes are complex proteins that catalyze biochemical reactions, speeding up reactions in the body without being consumed in the process. Each enzyme is a protein composed of a specific sequence of amino acids that folds into a unique three-dimensional structure, giving it the ability to interact with specific molecules (substrates) and facilitate a chemical reaction. Amino acids contribute to the structure and function of enzymes by determining their shape and active sites but on their own, they do not possess catalytic activity. In summary, while amino acids and enzymes are fundamentally related, with the former being critical to the structure and function of the latter, they are not the same; amino acids are the building blocks, and enzymes are the functional proteins made from these blocks.

Paton's Grace Yarn is a type of knitting and crochet yarn produced by Patons, a well-known brand in the world of crafting. This particular yarn is highly regarded for its softness, versatility, and ease of care. It's made primarily from acrylic fibers, which give it durability and make it suitable for various projects ranging from garments to home decor items. Paton's Grace Yarn is available in a wide array of colors, allowing for creative freedom and the ability to match specific design needs. Its smooth texture makes it ideal for creating intricate stitch patterns and designs. It's also machine washable and dryable, making it a practical choice for everyday use. Whether you're an experienced crafter or just starting out, Paton's Grace Yarn offers excellent value and performance.