Cell Membrane Transport Quiz

Movement of molecules across a membrane without energy input, following a concentration gradient.

Movement of molecules across a membrane requiring energy, often against a concentration gradient.

Movement of molecules from high to low concentration.

Diffusion of water across a semipermeable membrane.

Difference in concentration of a substance across a space.

Passive transport aided by transport proteins.

Proteins embedded in the cell membrane that assist in the movement of molecules.

Adenosine triphosphate, a molecule that stores energy for cellular processes.

Describes the cell membrane as a fluid, dynamic structure with embedded proteins and cholesterol.

Controls what enters and leaves the cell, and provides structural support.

Membrane proteins/lipids with attached sugar chains, involved in cell recognition and signaling.

Individual phospholipids move freely within their layer of the cell membrane.

Cholesterol regulates membrane fluidity, making it more rigid at higher temps and less fluid at lower temperatures.

A bilayer of phospholipids with embedded proteins and cholesterol.

The process by which different cells recognize each other.

The cell membrane is made of proteins, carbohydrates, and phospholipids. Proteins are embedded or attached to the membrane; carbohydrates are on the surface, and phospholipids form the membrane layers.

Membrane proteins have various roles, from transporting molecules across the membrane to maintaining cell shape and structure.

Membrane proteins can be partly or wholly embedded in the membrane, or they can be attached to the surface.

Some membrane proteins are designed to transport materials across one layer, while others span both layers to move substances in and out of the cell.

Carbohydrates on the cell membrane surface, often attached to lipids or proteins, help with cell identification and interaction with other cells.

Carbohydrates linked to lipids on the cell membrane.

Carbohydrates linked to proteins on the cell membrane.

The cell membrane is a double layer of phospholipids that surrounds and protects the cell, separating it from its surroundings.

A phospholipid has a hydrophilic head (attracted to water) and a hydrophobic tail (repelled by water).

The space between the phospholipid layers prevents many molecules from passing directly through, and only specific things can pass.

Membrane proteins help move nutrients, waste, and other molecules across the membrane.

These proteins allow cells to identify and interact with each other and other molecules.

Some membrane proteins defend the cell from harm.

Proteins that speed up chemical reactions inside or outside cell.

Membrane proteins can be embedded within or on the surface of the phospholipid bilayer, depending on their role.

Membrane proteins aid in moving nutrients through the space between the two phospholipid layers.