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Which of the following is not classified as an organelle?

  1. Nucleus

  2. Golgi apparatus

  3. Lysosome

  4. Chlorophyll

The correct answer is: Chlorophyll

Chlorophyll is not classified as an organelle because it is a pigment that exists within certain organelles, primarily in chloroplasts of plant cells. Its primary function is to absorb light for photosynthesis, which occurs in the chloroplasts where chlorophyll is housed. In contrast, the nucleus, Golgi apparatus, and lysosome are all distinct cellular structures (organelles) with specific functions. The nucleus serves as the control center of the cell, housing genetic material. The Golgi apparatus is involved in modifying, sorting, and packaging proteins and lipids for secretion or delivery to other organelles. Lysosomes contain enzymes that break down waste materials and cellular debris. Thus, while chlorophyll plays a crucial role in the process of photosynthesis, it does not fulfill the criteria of being an independent organelle.