Unit 1-Transport Across Cell Membrane Flashcards
Components of the cell membrane
Phospholipids and proteins
Term for only allowing certain (small) molecules to pass across membrane
Selectively permeable
Term meaning transport of molecules does NOT require energy
Passive
Difference in concentration of a substance inside and outside a cell
Concentration gradient
The movement of a substance from an area of high concentration to an area of low concentration DOWN the concentration gradient
Diffusion
The movement of WATER from an area of high concentration to an area of low concentration DOWN the concentration gradient
Osmosis
Term for solutions that have a lower water concentration than the cell
Hypertonic
Term for solutions that have a higher water concentration than the cell
Hypotonic
Term for solutions that are have equal concentration as the cell
Isotonic
Term for solutions that have higher solute concentration than the cell
Hypertonic
Term for solutions that have a lower solute concentration than the cell
Hypotonic
Appearance of plant cells in strong salt solution
Plasmolysed
Effect of strong salt solution on animal cells
Shrivel or shrink
Effect of a solution with higher water concentration on animal cells
Bursts (no cell wall)
Appearance of plant cell immersed in pure water
Turgid
Term for the movement of a substance across the cell membrane AGAINST the concentration gradient and requiring energy
Active transport
Part of membrane that pumps molecules from low to high concentrations
Protein (pumps)
Molecule that diffuses into leaf for photosynthesis
Carbon Dioxide
Substances that diffuse out of animal cells before building up to harmful levels
Carbon dioxide
Urea
Molecule that diffuses into cells needed for aerobic respiration
Oxygen
Molecules which diffuse into cell required for protein synthesis
Amino acids
