Ch. 3 Cells Movement through cell membranes

Front

What is exocytosis?

Back

Exocytosis is the process by which cells expel materials in vesicles that fuse with the plasma membrane, releasing their contents outside the cell.

Front

What is the role of phospholipids in the cell membrane?

Back

Phospholipids form a bilayer that makes up the cell membrane, with hydrophilic heads facing outward and hydrophobic tails facing inward, creating a semi-permeable barrier.

Front

What macromolecules are found in the cell membrane?

Back

The cell membrane contains proteins, lipids, and carbohydrates, but does not contain nucleic acids.

Front

What is the function of the smooth endoplasmic reticulum?

Back

The smooth endoplasmic reticulum is responsible for the synthesis of lipids and detoxification of certain chemicals.

Front

What is the energy source for active transport?

Back

Active transport requires energy in the form of ATP to move substances against their concentration gradient.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a passive transport process that uses transport proteins to help move molecules across the cell membrane without energy.

Front

What is the difference between active transport and passive transport?

Back

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

Front

What is the function of membrane proteins?

Back

Membrane proteins assist in transport, act as receptors for signaling, and provide structural support to the cell membrane.

Front

What is endocytosis?

Back

Endocytosis is the process by which cells engulf substances from the outside environment, forming vesicles to bring them into the cell.

Front

What is the role of carbohydrates in the cell membrane?

Back

Carbohydrates on the cell membrane serve as recognition sites for cell signaling and communication.