Protons are positive and 1 atomic mass unit (or AMU), neutrons are neutral and 1 AMU, and electrons are negative and have no real weight.
The answer is C oxygen.
Hope this helps.
Answer:
all of these affect enzyme activity
The primary function of the plasma membrane is to protect the cell from its surroundings. Composed of a phospholipid bilayer with embedded proteins, the plasma membrane is selectively permeable to ions and organic molecules and regulates the movement of substances in and out of cells.
