What is the difference between protoplasm and protoplast?

Protoplasm and protoplast are two biological terms often used to describe the living content of a cell, but they refer to different components.

Protoplasm is the living substance inside a cell that includes both the cytoplasm and nucleoplasm. It is a jelly-like, viscous material enclosed by the plasma membrane. The protoplasm contains various organelles such as the nucleus, mitochondria, endoplasmic reticulum, ribosomes, and others. It serves as the site for most of the cell’s vital biochemical activities, including metabolism, respiration, and synthesis of biomolecules. Protoplasm is often called the “physical basis of life” because all the living processes of a cell occur within it.

Protoplast, on the other hand, refers to the entire cell without its cell wall. It consists of the plasma membrane, cytoplasm, and nucleus. The protoplast can be obtained experimentally by removing the rigid cell wall using enzymes such as cellulase or pectinase. In plants, protoplasts are useful in genetic engineering, hybridization, and tissue culture because they can fuse with other protoplasts or take up foreign DNA easily.

In summary, the main difference is that protoplasm is the living content inside the cell, while protoplast is the cell without its cell wall. All protoplasts contain protoplasm, but protoplasm alone is not equivalent to a protoplast.