During a rat dissection, which eukaryotic organelle would be most visible under a light microscope when observing stained liver cells?

• A. Golgi apparatus
• B. Lysosome
• C. Mitochondrion
• D. Nucleus

Answer: (D)

Verified step by step guidance

1. Understand the context: The question asks which eukaryotic organelle is most visible under a light microscope when observing stained liver cells. Light microscopes have limitations in resolution, so only larger organelles can be clearly observed.
2. Recall the size and visibility of the organelles: The nucleus is the largest organelle in eukaryotic cells and is easily visible under a light microscope, especially when stained. Other organelles like the Golgi apparatus, lysosomes, and mitochondria are smaller and less distinct under a light microscope.
3. Consider the staining process: Stains such as hematoxylin and eosin (H&E) are commonly used in histology. Hematoxylin stains the nucleus a dark blue or purple color, making it stand out prominently in stained tissue sections.
4. Eliminate the other options: The Golgi apparatus, lysosomes, and mitochondria are smaller and require higher resolution techniques, such as electron microscopy, to be clearly observed. These organelles are not as visible under a standard light microscope.
5. Conclude that the nucleus is the correct answer: Based on its size, visibility, and the effect of staining, the nucleus is the most visible organelle under a light microscope when observing stained liver cells.