What do the esophagus and the stomach have in common? a. both contain chyme. b. both contain partially digested food. c. both contain waste material ready for removal. d. both contain stored food.

Which of the following describe the role a biochemical pump plays in active transport? a it prevents water from moving across the cell membrane. b it uses energy to move materials across the cell membrane against the concentration gradient. c it large molecules cross the cell membrane without using energy. d it a cell move molecules from an area of higher concentration to an area of lower concentration.