Question

name__ class date the molecule to be taken in (figure 5 - 3). this folded in section of the cell membrane then pinches off inside the cell forming a vacuole. in phagocytosis the cell surrounds and engulfs large undissolved particles by flowing around them and enclosing them in a vacuole. review questions 1. describe the cell membrane. 2. explain the following terms: passive transport diffusion equilibrium osmosis active transport pinocytosis phagocytosis __

Explanation:

1. The cell membrane is a selectively - permeable phospholipid bilayer that surrounds the cell, controlling the movement of substances in and out of the cell and providing structural support.
2. Passive transport is the movement of substances across the cell membrane without the use of energy, down a concentration gradient. Diffusion is the movement of molecules from an area of high concentration to an area of low concentration. Equilibrium is a state where the concentration of a substance is the same throughout a space. Osmosis is the diffusion of water across a selectively - permeable membrane. Active transport is the movement of substances across the cell membrane against a concentration gradient, requiring energy. Pinocytosis is the process by which a cell takes in small droplets of extracellular fluid. Phagocytosis is the process by which a cell engulfs and digests large particles or other cells.

Answer:

1. A selectively - permeable phospholipid bilayer controlling substance movement and providing structural support.
2. Passive transport: Movement without energy down concentration gradient.

Diffusion: Molecule movement from high to low concentration.
Equilibrium: Uniform substance concentration.
Osmosis: Water diffusion across membrane.
Active transport: Movement against gradient, energy - requiring.
Pinocytosis: Cell takes in extracellular fluid droplets.
Phagocytosis: Cell engulfs and digests large particles/cells.