The question of how many amino acids equal a Dalton does not have a straightforward numerical answer because the relationship between amino acids and Daltons (also known as atomic mass units, AMUs) isn't one-to-one. Amino acids, the building blocks of proteins, vary in molecular weight. For instance, glycine, the smallest amino acid, has a molecular weight of approximately 75 Daltons, while tryptophan, one of the heaviest, weighs around 204 Daltons. Given this variability, we cannot equate a specific number of amino acids to a single Dalton. Instead, the concept of molecular weight is used to describe the mass of one molecule of an amino acid. To calculate the molecular weight of a protein, you sum the molecular weights of its constituent amino acids, taking into account any modifications or water molecules lost during peptide bond formation.

Polyvinyl chloride (PVC) is a type of plastic widely used in construction, packaging, and many other applications. Concerns have been raised about its potential health impacts, particularly regarding cancer. The main issue with PVC is not the polymer itself but the additives used (like phthalates) and the release of dioxins when PVC is burned. Dioxins are highly toxic and can cause cancer. Moreover, during its manufacture, a carcinogen known as vinyl chloride monomer (VCM) is used, which poses a significant health risk to factory workers through inhalation. The general public's risk from using PVC products under normal conditions is considered low, but the risk increases with direct, prolonged exposure to harmful additives or when burning PVC waste. It is crucial for industries to follow strict safety guidelines and for consumers to use PVC products appropriately and avoid burning them.

The cost of PVC doors varies widely depending on several factors such as size, design, and the quality of the material. On average, you might expect to pay anywhere from $100 to $1,000 or more for a PVC door. Basic models and sizes tend to be at the lower end of this range, while larger, more ornate designs with additional features like enhanced security elements or insulation could drive the price higher. Prices can also vary by region due to differences in labor costs and market demand. It's wise to get multiple quotes to compare prices and to consider the door's energy efficiency and durability when evaluating the value. Remember, the cheapest option may not always be the best in terms of longevity and performance.