B1 - CELL STRUCTURE AND TRANSPORT

KEYWORDS

cell

Unit of a living organism

Eukaryotic Cell

ANIMAL, PLANT,& FUNGUS CELL. DNA is confined to nucleus

Prokaryotic Cell

BACTERIUM CELL. DNA NOT confined to nucleus

Diffusion

Spreading of particles from high to low concentration

Osmosis

DIFFUSION OF WATER - through a partially permeable membrane from HIGH TO LOW concentration of water

Active Transport

Movement of substances from DILUTE SOULTON to more CONCENTRATED SOLUTION. Requires energy

Partially permeable membrane

MEMEBRANE that ONLY ALLOWS CERTAIN SUBSTANCES TO GO THROUGH

OSMOSIS KEY TERMS:

OSMOSIS KEY TERMS:

ISOTONIC SOLUTION:

CONCENTRATION OF SOLUTES —> outside cell = SAME as INTERNAL concentration --> SOLUTION = ISOTONIC

HYPERTONIC SOLUTION

CONCENTRATION OF SOLUTES —> outside cell = HIGHER than INTERNAL concentration --> SOLUTION = HYPERTONIC

HYPOTONIC SOLUTION

CONCENTRATION OF SOLUTES —> outside cell = LOWER than INTERNAL concentration --> SOLUTION = HYPOTONIC