How does acidity affect enzymes in the cytoplasm of the cell?

The acidity affect enzyme reactions in that; The enzymes have an optimal pH, at which their reaction rate is maximized. 
Enzymes speed up the reactions between molecules in cells, and reduce the energy needed to enact the reaction. Very high pH would denature the enzymes as the enzymes work best at an optimum pH and temperature.

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.

Active site is where they touch.