Q3: Which of the following is an example of active transport? A) oxygen diffusing across the cell membrane
B) glucose entering a cell by using channel protein
C) water leaving a cell by osmosis
D) a cell consuming a bacteria cell (phagocytosis)

Molecules like glucose and amino acids are not lipid soluble, so cannot cross the cell membrane by simple diffusion. instead, they are shuttled across by carrier proteins in the membrane from high to low concentration. does this process require energy from the cell? this is an example of what type of molecular movement?