Cell Transport Mechanisms and Characteristics

What is a fundamental characteristic of cells according to cell theory?

• Cells are always multicellular.

• Cells are alive.

• Cells are static and do not move.

• Cells are only found in animals.

In the process of diffusion, how do particles typically move?

• From an area of low concentration to an area of high concentration.

• From an area of high concentration to an area of low concentration.

• Only with the help of energy from the cell.

• Only through specialized protein channels.

Which statement accurately describes passive transport mechanisms like diffusion?

• They require the cell to expend ATP energy.

• They move substances against their concentration gradient.

• They move substances from an area of higher concentration to an area of lower concentration without requiring cellular energy.

• They are primarily used for transporting very large molecules.

How does facilitated diffusion differ from simple diffusion?

• Facilitated diffusion requires the cell to use ATP.

• Facilitated diffusion moves molecules against their concentration gradient.

• Facilitated diffusion utilizes carrier proteins or channels to move molecules down their concentration gradient.

• Facilitated diffusion is only used for water transport.

What is the process called when a cell engulfs large solid particles from its external environment?

• Pinocytosis

• Exocytosis

• Phagocytosis

• Receptor-mediated endocytosis