How do cells regulate the activity of the enzymes?

Atypical human cell is approximately 12.00 μm in diameter and enclosed by a membrane that is 5.000 nm thick. (a) what is the volume of the cell including the membrane? (b) what is the volume of the cell membrane? (c) what percent of the total volume does its membrane occupy? to simplify the calculations, model the cell as a sphere. enter your answers using four significant figures.

Are the earth's ocean floor and continents the same age geologically? why or why not?

The combining form leuk/o means red true or false