1. True or False: Lipids are primarily hydrophilic molecules. - Answer: False. Rationale: Lipids are predominantly hydrophobic due to their long hydrocarbon chains, although they can contain hydrophilic regions, such as the phosphate group in phospholipids. 2. Fill in the blank: The primary structural component of the cell membrane that forms a bilayer is the __________. - Answer: Phospholipid. Rationale: Phospholipids have both hydrophilic and hydrophobic regions which allow them to form a bilayer, creating a semi-permeable membrane. 3. Multiple Choice: Which of the following is not a function of lipids? A) Energy storage B) Hormone synthesis C) Insulation and protection D) Acting as an enzyme - Answer: D) Acting as an enzyme. Rationale: While lipids have many roles, they are not known to act as enzymes; this function is typically reserved for proteins. 4. Open-ended: Describe the process and significance of lipid peroxidation. - Answer: Lipid peroxidation refers to the oxidative degradation of lipids. It is significant because it can lead to cell damage and is involved in various diseases. 5. True or False: Steroids are a type of fatty acid. - Answer: False. Rationale: Steroids are a class of lipids distinct from fatty acids; they have a characteristic structure of four fused rings.