The Fundamental Unit of Life Notes

Nature and Occurrence:

• It was discovered by Camillo Golgi.
• It consist of a network of membrane bound tubules and sac which are interconnected with endoplasmic reticulum.
• They are found in cytoplasm nearer to the nucleus.
• These are absent in prokaryotic organisms like bacteria as well as in mature sperms, red blood cells etc in higher organisms like mammals.

Structure:

Nature, Occurrence and structure:

• Lysosomes are small, dark, spherical, sac like structures.
• They are bound by a single membrane.
• They are distributed in the cytoplasm of eukaryotic cells.
• Their cavity is filled with fluid which contains digestive enzymes.
• Lysosomal enzymes are secreted by endoplasmic reticulum and are transported to it through Golgi Apparatus.
• These enzymes help in intracellular digestion and thus act as a disposal system of the cell.

Nature and occurrence:

• Several oval or cylindrical shape structures are found in cytoplasm
• Membrane bound organelle.
• It is known as powerhouse of the cell.

Structure: