Question

Neutral lipids are comprised of which of the molecules

• A. Glycerol and phosphoric acid
• B. Glycerol and fatty acids
• C. Glycerol and steroids
• D. Glycerol and carbohydrates

Hint:

Lipid Types:
Neutral Lipids = Triglycerides (Glycerol + 3 Fatty Acids; Uncharged).
Polar Lipids = Phospholipids (Glycerol + 2 FA + Phosphate + Head group).

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Neutral (uncharged) storage lipids consist of hydrophobic fatty acid triesters of glycerol (triacylglycerols triglycerides).
Key Formula or Approach:
\[ \text{Glycerol} + 3\text{ Fatty Acids} \xrightarrow{\text{Esterification}} \text{Triacylglycerol (Neutral Triglyceride)} + 3\text{H}_2\text{O} \]

Step 2: Detailed Explanation:
Lipid classification by polarity:
1. Neutral Lipids (Triacylglycerols Triglycerides): Composed exclusively of one glycerol molecule esterified with three fatty acid chains. Because all polar carboxyl and hydroxyl groups are consumed in neutral covalent ester linkages, these storage lipids carry no ionic charge at physiological pH and are completely non-polar/hydrophobic.
2. Polar Amphipathic Lipids: Phospholipids (contain charged phosphate headgroups) and Glycolipids (contain polar carbohydrate moieties).

Step 3: Final Answer:
Thus, neutral lipids are comprised of Glycerol and fatty acids, corresponding to option (B).