14. Oncogenes are mutated forms of genes. Oncogenes can transform a cell into a tumor cell Some tumor cells are benign, while others are malignant. How does the
presence of an oncogene lead to the formation of a tumor?

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.