Cell Processes - Active and Passive Transport Online Quiz

Active transport is a cellular process that moves molecules against a concentration gradient, which requires energy in the form of ATP.

Moving particles from an area of lower concentration to an area of higher concentration is moving against the gradient, which requires active transport.

The cell membrane acts as the selective barrier that regulates the passage of materials into and out of the cell.

Active transport is defined as the movement of substances across a cell membrane that requires the expenditure of energy.

Diffusion is a form of passive transport, meaning it occurs naturally due to the kinetic energy of particles and does not require the cell to expend energy.

Osmosis is the movement of water across a semipermeable membrane from an area of higher water concentration to lower concentration. When celery wilts, it loses water; soaking it allows water to re-enter the cells via osmosis, restoring turgor pressure.

Cells are primarily composed of water, and their internal environment must be balanced with the external environment to maintain homeostasis. Osmosis is critical for regulating the water content within these fluid-filled structures.

Osmosis is specifically defined as the diffusion of water molecules across a selectively permeable membrane. Other terms like exocytosis and endocytosis refer to the movement of larger particles via vesicles.

Passive transport is the movement of substances across a cell membrane without the use of energy, moving down the concentration gradient from an area of higher concentration to an area of lower concentration.

Diffusion is the net movement of particles from a region of higher concentration to a region of lower concentration. It does not require energy or the formation of vesicles.