Which part of the cell is known as the semifluid portion?

Cytosol is the term that specifically refers to the semifluid portion of the cytoplasm. It is the liquid matrix where various cellular components, such as organelles and macromolecules, are suspended. This gel-like substance plays a crucial role in cellular processes by providing a medium for the dissolution and transport of substances within the cell.

In contrast, cytoplasm includes not only the cytosol but also the membrane-bound organelles, making it a broader term. While ribosomes are essential for protein synthesis, they are not part of the semifluid portion. The cell membrane, on the other hand, is a phospholipid bilayer that surrounds and protects the cell, but it does not constitute the semifluid matrix where metabolic processes occur. Therefore, cytosol is the most accurate answer to describe the semifluid portion of the cell.