PTP Ch 3.2 Flashcards
(9 cards)
What is diffusion?
The process by which molecules move from an area of higher concentration to an area of lower concentration.
What molecules can easily pass through the cell membrane?
Small nonpolar molecules and certain gases.
How are molecules transported against their concentration gradient?
With the help of ATP.
What are the 3 types of endocytosis?
- Phagocytosis
- Pinocytosis
- Receptor-mediated endocytosis
What is osmosis?
The diffusion of water molecules across a selectively permeable membrane.
Define hypertonic, isotonic, and hypotonic solutions.
- Hypertonic: Higher solute concentration outside the cell
- Isotonic: Equal solute concentration inside and outside the cell
- Hypotonic: Lower solute concentration outside the cell
How do plant cells react to a hypotonic environment?
They become turgid due to water uptake.
How do animal cells react to a hypertonic environment?
They shrink due to water loss.
Fill in the blank: The process of moving molecules from low concentration to high concentration is called _______.
active transport
