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AP Biology : 1.5 Lipids – Exam Style questions

AP Biology :1.5 Lipids- Exam Style questions with Answer- FRQ

Question

Which of the following is not a biological function of lipids?
(A) cushioning and insulation
(B) precursors to the synthesis of signaling molecules
(C) energy
(D) joint lubrication

Answer/Explanation

Ans: D

Answer choices A, B, and C are all functions of lipids in the body.
Joints are places where two bones meet. Some joints are immovable, but
movable joints are cushioned and lubricated in several ways. The joint itself
is encased in a fluid-filled capsule, but the composition of synovial (joint)
fluid is not lipid. It is a thick, stringy fluid made of hyaluronic acid (a
glycosaminoglycan, a long, unbranched polysaccharide made of repeating
disaccharides) and lubricin (a proteoglycan, a protein that has been heavily
glycosylated).

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