Biology Chapter: Membrane Transport Quiz

The movement of very small, nonpolar molecules directly through the phospholipid bilayer of the cell membrane.

The movement of large or charged molecules across the cell membrane using transport proteins

The movement of water across a semipermeable membrane from an area of high water concentration to an area of low water concentration.

This type of cell transport does not require energy and molecules move from an area of high concentration to an area of low concentration.

Once the concentration of molecules is equal on both sides of the membrane, there is no net movement of molecules.

A solution where the concentration of solutes is lower outside the cell than inside the cell. Water moves into the cell.

A solution where the concentration of solutes is higher outside the cell than inside the cell. Water moves out of the cell.

A solution where the concentration of solutes is equal inside and outside the cell. Water moves in both directions at the same rate.

The pressure exerted by the cell's contents against the cell wall in plants. This pressure helps maintain the plant's upright structure.

A specialized organelle found in some single-celled organisms. It helps remove excess water from the cell to prevent it from bursting.

The difference in concentration of a substance between two areas.

The substance that dissolves in a solvent.

The substance that dissolves the solute.

A mixture of solute and solvent.

The overall direction of movement of molecules across a membrane.

The movement of solute molecules from an area of high concentration to an area of low concentration.

A type of membrane that allows some substances to pass through but not others.

The process of comparing the concentration of solutions inside and outside a cell to predict water movement and cell impact due to osmosis.

The cell membrane, also known as the plasma membrane, is a vital structure found in all cells. It's flexible and fluid, acting as a barrier between the cell's interior and its external environment.

The primary function of the cell membrane is to control what enters and exits the cell. It acts as a selective barrier, ensuring the cell maintains its internal balance, known as homeostasis.

The cell membrane is composed of two layers of phospholipids. Each phospholipid has a hydrophilic head that faces the water-based environments inside and outside the cell, and a hydrophobic tail that faces inwards, creating a barrier.

The term 'intracellular' refers to anything located inside the cell, while 'extracellular' refers to anything located outside the cell.

The cell membrane, while essential for control and protection, doesn't provide rigid structure for the cell. That function is typically performed by the cell wall in plant cells or the cytoskeleton in animal cells.

Cell membrane proteins that are embedded within the membrane itself, interacting with its hydrophobic core.

Cell membrane proteins that are attached to the surface of the membrane, but don't extend into its hydrophobic core.

These junctions allow for direct communication between adjacent cells, enabling rapid signal transmission.

A model that describes the cell membrane as a flexible structure composed of various components, constantly in motion.

These molecules help stabilize the cell membrane by adjusting its fluidity in different temperatures.