Transport Across Membranes (LC 2027) (Leaving Cert Biology): Flashcards

Molecules spreading from high to low concentration

None - it's a passive process

From high to low concentration (down gradient)

Diffusion of water across selectively permeable membrane

From high to low water concentration

Allows some substances through, blocks others

Swells and may burst

Shrinks and becomes crenated

Becomes turgid (swollen and firm)

Plasmolysis (cytoplasm shrinks away from wall)

Outward pressure of cytoplasm against cell wall

Creates hypertonic environment, dehydrates microorganisms

Requires energy (ATP)

Against concentration gradient (low to high)

Absorbs minerals from soil against gradient