Cell Membrane

Front

What is the structure of the cell (plasma) membrane?

Back

The cell membrane is a flexible boundary composed of a phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates.

Front

What is the primary function of the cell membrane?

Back

The primary function of the cell membrane is to protect the cell and regulate the movement of substances in and out of the cell.

Front

What does 'hydrophobic' mean in the context of cell membranes?

Back

Hydrophobic refers to molecules that do not interact with water; in cell membranes, hydrophobic regions help to form the barrier that separates the inside of the cell from the external environment.

Front

What role do proteins play in the cell membrane?

Back

Proteins in the cell membrane serve various functions, including transport, acting as channels or carriers, signaling, and providing structural support.

Front

How does cholesterol affect the fluidity of the cell membrane?

Back

Cholesterol helps to maintain membrane fluidity by preventing the fatty acid chains of phospholipids from packing too closely together, especially at varying temperatures.

Front

What is the difference between hydrophilic and hydrophobic molecules?

Back

Hydrophilic molecules are attracted to water and can interact with it, while hydrophobic molecules repel water and do not mix with it.

Front

What is a covalent bond and how is it relevant to water molecules?

Back

A covalent bond is a type of chemical bond where atoms share electrons; in water, each hydrogen atom shares electrons with the oxygen atom, forming a stable molecule.

Tags

NGSS.MS-PS1-1

Front

What is the significance of the phospholipid bilayer in the cell membrane?

Back

The phospholipid bilayer forms the fundamental structure of the cell membrane, creating a semi-permeable barrier that separates the cell's interior from the external environment.

Front

What is the function of membrane carbohydrates?

Back

Membrane carbohydrates play a role in cell recognition, signaling, and adhesion by forming glycoproteins and glycolipids.

Front

How do temperature changes affect the cell membrane?

Back

Temperature changes can affect the fluidity of the cell membrane; higher temperatures increase fluidity, while lower temperatures can make the membrane more rigid.