In an experiment, the condition that is manipulated by a scientist is the while the condition that is measured is the
a. independent variable. . dependent variable
b. dependent variable. . independent variable
c. controlled variable. . independent variable
d. theoretical variable. . hypothetical variable

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.