NEET 2026
- Exam
- NEET
- Year
- 2026
- Subject
- Biology
- Chapter
- Chapter
NEET 2026 · Biology · Chapter
Given below is a list of biomolecules: A. Arachidonic acid B....
Given below is a list of biomolecules:
A. Arachidonic acid
B. Lecithin
C. Cholesterol
D. Tripalmitin
E. Palmitic acid
Which of the following biomolecules do NOT contain a glycerol backbone in their structure?
A. Arachidonic acid
B. Lecithin
C. Cholesterol
D. Tripalmitin
E. Palmitic acid
Which of the following biomolecules do NOT contain a glycerol backbone in their structure?
Options
- AB and D only
- BA, C and E only
- CA, B and D only
- DC, D and E only
Correct answer
B. A, C and E only
Step-by-step solution
Arachidonic acid is a polyunsaturated fatty acid with 20 carbon atoms. It does not contain a glycerol backbone.
Lecithin is a phospholipid containing a glycerol backbone attached to two fatty acids, a phosphate group, and a choline molecule.
Cholesterol is a lipid with a sterol ring structure. It does not contain a glycerol backbone.
Tripalmitin is a triglyceride formed by the esterification of glycerol with three molecules of palmitic acid. It contains a glycerol backbone.
Palmitic acid is a saturated fatty acid with 16 carbon atoms. It does not contain a glycerol backbone.
Therefore, Arachidonic acid (A), Cholesterol (C), and Palmitic acid (E) do not contain a glycerol backbone.
Answer: A, C and E only
Lecithin is a phospholipid containing a glycerol backbone attached to two fatty acids, a phosphate group, and a choline molecule.
Cholesterol is a lipid with a sterol ring structure. It does not contain a glycerol backbone.
Tripalmitin is a triglyceride formed by the esterification of glycerol with three molecules of palmitic acid. It contains a glycerol backbone.
Palmitic acid is a saturated fatty acid with 16 carbon atoms. It does not contain a glycerol backbone.
Therefore, Arachidonic acid (A), Cholesterol (C), and Palmitic acid (E) do not contain a glycerol backbone.
Answer: A, C and E only