The movement of small molecules from high concentration to low concentration.
What is diffusion?
Channel proteins do not use ATP, and move molecules down the concentration gradient; protein pumps use energy from ATP.
What is the primary difference between a channel protein and protein pump?
What is the basic structure of all cell membranes, including cell-surface membranes and the membranes around cell organelles of eukaryotes?
Fluid-mosaic model
Biomolecule that acts as a channel to allow molecules to move in and out of the cell.
What are proteins?
Which of the following is NOT a component of the fluid-mosaic model of the membrane structure: phospholipids, glycolipids, proteins, nucleic acids
Nucleic Acids
Which of the following can move into the cell directly across the membrane by simple diffusion? (ex. Na+ , O2, C6H12O6, K+)
O2 gas molecules
After diffusion or osmosis a cell will be in this state.
What is equlibrium (homeostasis)?