What is active transport? How do cells deal with osmosis?
Active transport is a process in which proteins in the cell membrane pump materials in the opposite direction to which they would move by diffusion. This allows cells to counteract osmosis but it is an energy-intensive process that represents over one-third of a cell’s total energy expenditure. 34. Preview: What are ions? What is salinity? What is a solute? Ions are atoms or groups of atoms that have a negative or positive charge. Salinity is the total amount of salts dissolved in water. Salts are combinations of ions. Solutes are ions, organic molecules, or anything else that is dissolved in a solution (such as water). 35. What are two strategies that marine organisms use to regulate salt and water balance within their cells and bodies? Osmoconformers have an internal salinity that is the same as the surrounding water and if the external salinity changes so does the internal salinity of the organism. Typically, they can only tolerate small changes in salinity before osmosis causes the
