Chapter 6, Problem 2RA

Which of these statements about the facilitated diffusion of glucose is true?

$\begin{array}{l}\text{a}\text{. There is a net movement from the region of lower to the}\hfill \\ \text{ region of higher concentration}\text{.}\hfill \\ \text{b}\text{. Carrier proteins in the plasma membrane are required for}\hfill \\ \text{ this transport}\text{.}\hfill \\ \text{c}\text{. This transport requires energy obtained from ATP}\text{.}\hfill \\ \text{d}\text{. It is an example of cotransport}\text{.}\hfill \end{array}$