What is the term for the diffusion of water across a semipermeable membrane?

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity

You are given an electron micrograph of a bacterial cell. in the micrograph you can clearly see three thin layers of different densities surrounding the cell. based on the micrograph, you can infer that this cell is and would appear after application of the gram stain procedure. gram-negative / pink gram-positive / purple gram-positive / pink gram-negative / purple

What determines whether a particular cell is able to respond to a hormone?