Biology Active and Passive Transport

Questions and Answers

What is diffusion?

Active transport of ions

Movement of water molecules only

Active movement using transport proteins

Passive movement of molecules in and out of a cell (correct)

What is facilitated diffusion?

Passive diffusion with a transport protein (correct)

Movement of water through osmosis

Passive diffusion without any proteins

Active movement of ions

What is osmosis?

Endocytosis process

Passive diffusion of water molecules (correct)

Active transport of ions

Movement of dissolved solids

What are ion pumps?

Control amounts of specific ions inside a cell Signup and view all the answers

What is exocytosis?

Process where vesicles fuse with the plasma membrane to expel contents Signup and view all the answers

What is pinocytosis?

Active endocytosis of surrounding fluid Signup and view all the answers

What is phagocytosis?

Active endocytosis that engulfs solid objects Signup and view all the answers

What is receptor-mediated endocytosis?

Endocytosis involving proteins with receptor sites Signup and view all the answers

Study Notes

Active and Passive Transport

Diffusion:
- A passive process where molecules (liquids, solutes, gases) move across a cell membrane, balancing concentrations inside and outside the cell.
Facilitated Diffusion:
- A passive transport method that utilizes specific transport proteins to help molecules cross the cell membrane without energy expenditure.
Osmosis:
- Passive diffusion specifically referring to the movement of water molecules across a semipermeable membrane, crucial for maintaining cellular balance.
Ion Pumps:
- An active transport mechanism that regulates the concentration of specific ions (like Na⁺, K⁺) within a cell, functioning against the concentration gradient using energy.
Exocytosis:
- An active process where vesicles formed from the Golgi apparatus or endoplasmic reticulum fuse with the plasma membrane, releasing their contents outside the cell.
Pinocytosis:
- A type of active endocytosis, where the plasma membrane engulfs extracellular fluid, forming vesicles that bring fluid into the cell.
Phagocytosis:
- An active endocytosis process involving the engulfment of solid particles by the plasma membrane, creating a vacuole for digestion.
Receptor-Mediated Endocytosis:
- An active process where specific proteins with receptor sites interact with extracellular substances, allowing selective uptake via membrane invagination.

Description

Explore the fundamental concepts of active and passive transport in cells with these flashcards. Learn key terms such as diffusion, facilitated diffusion, osmosis, and ion pumps to enhance your understanding of cellular processes.