Q: Which of the following is not an example of a protein?
Correct: 0 / Attempted: 0
(A) Collagen
(B) Enzymes
(C) Hemoglobin
(D) Lecithin
Answer: (D) Lecithin Explanation: Proteins are large, complex molecules that play many critical roles in the body, including enzymes, collagen, and hemoglobin. However, lecithin is not a protein; it is a type of phospholipid, which is a fat molecule commonly found in cell membranes. This distinguishes lecithin from the other options, which are all proteins.
