Multiple Choice
Which of the following fatty acids is the precursor to the eicosanoids?
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10. Lipids
Eicosanoids
Multiple Choice
Which of the following is true regarding eicosanoids?
A
All eicosanoids contain three conjugated double bonds.
B
All eicosanoids contain arachidonic acid and sphingosine.
C
Prostaglandins and leukotrienes both contain a ring structure.
D
Thromboxanes, prostaglandins & leukotrienes all contain a carboxyl group.
Verified step by step guidance1
Understand the structure of eicosanoids: Eicosanoids are signaling molecules derived from arachidonic acid, a 20-carbon polyunsaturated fatty acid. They include prostaglandins, thromboxanes, and leukotrienes.
Analyze option A: Eicosanoids do not all contain three conjugated double bonds. While some may have conjugated double bonds, it is not a universal feature of all eicosanoids.
Evaluate option B: Eicosanoids are derived from arachidonic acid, but they do not contain sphingosine. Sphingosine is a component of sphingolipids, not eicosanoids.
Consider option C: Prostaglandins contain a cyclopentane ring, but leukotrienes do not have a ring structure. Therefore, this statement is incorrect.
Review option D: Thromboxanes, prostaglandins, and leukotrienes all contain a carboxyl group as part of their structure, which is consistent with their derivation from fatty acids. This makes option D the correct statement.
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