Honors Cell membrane and Cell Transport

Front

What is the fluid mosaic model of plasma membranes?

Back

The fluid mosaic model describes the plasma membrane as a mosaic of various components (lipids, proteins, carbohydrates) that move freely and fluidly, allowing for flexibility and functionality.

Front

Where can proteins be found in a plasma membrane?

Back

Proteins can be found embedded within the lipid bilayer, attached to the surface, or floating freely in the membrane.

Front

What is diffusion in the context of cell membranes?

Back

Diffusion is the process by which small molecules cross the lipid bilayer of the cell membrane from an area of higher concentration to an area of lower concentration.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane against their concentration gradient, requiring energy (usually in the form of ATP).

Front

What role do transport and channel proteins play in the cell membrane?

Back

Transport and channel proteins facilitate the passage of large or polar molecules through the cell membrane that cannot diffuse freely.

Front

What is the primary function of the cell membrane?

Back

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

Front

What is the difference between passive and active transport?

Back

Passive transport does not require energy and moves substances down their concentration gradient, while active transport requires energy to move substances against their concentration gradient.

Front

What are phospholipids and their role in the cell membrane?

Back

Phospholipids are molecules that make up the lipid bilayer of the cell membrane, with hydrophilic (water-attracting) heads and hydrophobic (water-repelling) tails, creating a barrier to most water-soluble substances.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What is the significance of membrane fluidity?

Back

Membrane fluidity is important for the proper functioning of the cell membrane, allowing for the movement of proteins and lipids, and facilitating cell signaling and transport.