Which organelle is labeled A? mitochondrion ribosome Golgi apparatus lysosome

**Question:**In a cellular diagram, which organelle corresponds to label A?**Options:**a. Mitochondrionb. Ribosomec. Golgi apparatusd. Lysosome**Answer:** 【Explanation】: Label A corresponds to the organelle responsible for protein synthesis, which is the ribosome. Ribosomes are the cellular structures where proteins are synthesized, and they can be found either free-floating in the cytoplasm or attached to the endoplasmic reticulum. Mitochondria (option a) are responsible for energy production in the form of ATP. Golgi apparatus (option c) is responsible for modifying, sorting, and packaging proteins and lipids for secretion or delivery to other organelles. Lysosomes (option d) are organelles containing enzymes that break down waste materials and cellular debris. Therefore, the correct answer is **b. Ribosome**.