Visible with a Compound Microscope:
* Nucleus: The control center of the cell, containing DNA.
* Cytoplasm: The gel-like substance that fills the cell.
* Cell membrane: The outer boundary of the cell.
* Mitochondria: The "powerhouses" of the cell, responsible for energy production.
* Golgi apparatus: Modifies and packages proteins.
* Endoplasmic reticulum (ER): A network of membranes involved in protein synthesis and lipid metabolism.
* Ribosomes: Sites of protein synthesis.
* Lysosomes: Small, membrane-bound organelles containing enzymes for digestion.
* Vacuoles: Storage compartments for water and other substances (larger in plant cells).
* Chloroplasts (in plant cells): Sites of photosynthesis.
Not Visible with a Compound Microscope:
* Viruses: Viruses are significantly smaller than most cellular components and require specialized electron microscopes to be visualized.
* Individual molecules: Molecules like DNA, proteins, and lipids are far too small to be seen with a compound microscope.
Why Compound Microscopes Have Limitations:
Compound microscopes use visible light and lenses to magnify objects. However, the resolution (ability to distinguish between two points) of a compound microscope is limited by the wavelength of visible light. This means that objects smaller than the wavelength of light cannot be distinguished.
Electron Microscopes:
For visualizing extremely small objects like viruses, molecules, and even the internal structures of organelles, scientists rely on electron microscopes. These microscopes use beams of electrons instead of light, which have much shorter wavelengths, allowing for much higher resolution.
