Osmosis, diffusion and active transport Flashcards
What is osmosis?
the movement of water
What does the membrane have to be to diffuse water across?
partially permeable
describe the concentration gradient for both osmosis and diffusion?
The particles move down the concentration gradient from areas of high concentration to areas of low concentration until equilibrium is achieved
which of these things requires energy to occur? Active transport, osmosis or diffusion?
active transport
what is the main reason that active transport occurs?
when cells need to take substances that go against the concentration gradient
describe the concentration gradient for active transport?
the particles move from areas of low concentration to areas of low concentration
where does the energy for active transport come from?
respiration
describe active transport using the transport protein?
the transport protein in the cell membrane has a hole big enough for the useful molecule outside of the cell, the useful molecule slots into the transport protein. The transport protein then turns releasing the molecule into the cell.
which part of active transport uses energy?
the turning of the transport protein
what isthe main difference between osmosis and diffusion
osmosis is only for the movement of water molecules
what are the two main differences between osmosis and active transport?
active transport requires energy whereas osmosis doesn’t, also active transport goes against the concentration gradient and osmosis goes down the concentration gradient
what process does this diagram represent?
active transport
What moves more quickly, smaller molecules such as carbon dioxide and oxygen or larger molecules such as glucose?
smaller molecules
Molecules in liquids and gasses move…
A) randomly
B) systematically
C) They don’t
A) randomly
how do molecules in liquids and gasses move?
randomly
