Final answer:
The cell (cytoplasmic) membrane indeed controls the flow of materials into and out of all bacterial cells, making the statement true.
Step-by-step explanation:
The statement that the cell (cytoplasmic) membrane under the cell wall controls the flow of materials into and out of the cell in all bacteria is true. The plasma membrane, which is also known as the cell membrane, is a phospholipid bilayer equipped with embedded proteins. This membrane ensures selective permeability, allowing certain substances to pass through while restricting others. The plasma membrane’s primary function is to control the passage of organic molecules, ions, water, and oxygen, and it is also responsible for the expulsion of wastes like carbon dioxide and ammonia from the cell. Thus, it plays a critical role in maintaining the appropriate conditions within the cell for life processes to occur.