Which statement about a triglyceride molecule are correct?1. It always contains unsaturated hydrocarbon tails2. It is formed using ester bonds3. It does not form hydrogen bonds4. It contains a hydrophilic glycerol head
Correct answer: D. 2 and 3 only
- A. 1, 2 and 3
- B. 2, 1 and 4
- C. 1 and 4 only
- D. 2 and 3 only
Explanation
Triglycerides are formed by linking fatty acids with an ester linkage to three alcohol groups in glycerol. Triglycerides are hydrophobic and so insoluble in water. The charges are evenly distributed around the molecule so hydrogen bonds to not form with water molecules. The correct answer is, therefore, D.
This question appeared on the HEC Phase II 2017 paper, which you can sit online with every answer explained.
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About Lipids
Lipids include fats, oils, waxes, phospholipids and steroids, which are largely insoluble in water and soluble in organic solvents. Coverage includes glycerol and fatty acids, ester bond formation, saturated and unsaturated fats, triglyceride functions, and phospholipids in cell membranes.
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