Therefore, as gravity affects all things equally, regardless of their mass in grams or kilograms, and because 1 m/s 2 = 100 cm/s 2, the surface gravity of Earth could be expressed in cgs units as 980.665 cm/s 2 and at base 10 logarithm (log g) as 2.992.
The cell wall is only in plants, and it gives the plants structure. The cell membrane controls the movement of substances entering and leaving the cell.
1 The plasma membrane acts as a partially permeable membrane and selectively controls the movement of substances in and out of a cell.  Factors that determine whether a molecule can pass through the plasma membrane are the size and polarity of the molecule.