Transport across Cell Membranes Flashcards
What does passive mean
A term that means the transport of molecules across a membrane that does not require energy
What is the effect of a LWC on animal cells
The cell shrinks
Why are the components of a cell membrane
Phospholipids and proteins
Molecule needed by a leaf cell for photosynthesis
Carbon dioxide
Substances that diffuses out of cells before building up to a poisonous level
Waste products
The movement of a molecule or ion through a membrane against a concentration gradients. Needs energy
Active transport
The difference in the concentration or a sugar she’d outside and inside a cell
Gradient
Term for when only some molecules are allowed to pass through
Selectively permeable
Membrane component that pumps molecules from a low concentration to a higher concentration
Protein
Effect of a solution with HWC on animal cells
The cell swells and bursts
A molecule which diffuses into a cell and is used to provide energy in aerobics respiration
Glucose
The movement of a substance from an area of high concentration to low concentration
Diffusion
The movement of water molecules form a HWC to a LWC through a selectively permeable membrane
Osmosis
Appearance of a plant cell immersed in pure water
The cell becomes turgid
What does a high temperature do to a membrane
It denatures the protein
Examples of passive transport
Diffusion and osmosis
Examples of substances that diffusion allow to enter/leave the cells
Oxygen, glucose and carbon dioxide
What does active transport require
ATP
What happens to an animal cell in SWC
It stays normal
What happens to an animal cell in HWC
It bursts
What happens to a plant cell in LWC
It becomes plasmolysed
What happens to a plant cell in HWC
It becomes turgid
