The transparent plastic used to make combs and hairbrushes is called:
Correct answer: D. Perspex
- A. PVA
- B. PVC
- C. Bakelite
- D. Perspex
Explanation
Perspex is a hard, brittle, and clear polymer that is mostly used in packaging materials, bowls, toys, combs, trays, disposable cutlery, etc.PVC: a type of plastic used for pipes that carry water and for many other products. ◊ PVC is anabbreviation of "polyvinyl chloride."PVA:PVA is used in many industries, such as the textile, paper industry, and food packaging industries.Bakelite: Bakelite continues to be used for wire insulation, brake pads and related automotivecomponents, and industrial electrical-related applications.
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The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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