Movement In & Out Of Cells Flashcards
Define diffusion
Net movement of particles from region of higher concentration to lower concentration down a concentration gradient as a result of their random movement
Where does the energy for diffusion come from
Kinetic energy from random movement of molecules and ions
Will diffusion be faster in gases or liquids? Why,?
Gases because the particles move faster
Why can’t diffusion happen in solids
Because the particles are in fixed position
Which state of matter can diffusion not take place in?
Solids
Does diffusion move up or down a concentration gradient
Down
Which chemical elements are found in carbohydrates
Carbon, hydrogen + oxygen
By which process does ink spread through jelly?
Osmosis
During osmosis, which molecules move and through which type of membrane?
Water, partially permeable
What is the Brownian motion
Radio, movement of small visible particles In suspension caused by unequal random bombardment of molecules of liquid or gas on visible particles
2 examples of Brownian motion
Zigzag movement of pollen grains in still water
Random movement of dust particles in still air
Define osmosis
Net movement of water molecules from region of high water potential(dilute solution) to lower water potential (concentrated solution) through partially permeable membrane
Through which part of the cell does water move through during osmosis?
Cell membrane
Define active transport
Movement of particles through cell membrane from a region of lower concentration to region of higher, against concentration gradient,using energy from respiration
How does the difference in concentration affect diffusion?
Bigger difference in concentration, faster diffusion rate
