| A | B |
|---|
| By the process of __________ water diffuses across a selectively permeable membrane | osmosis |
| Cell volume tends to stay the same in ______ extracellular fluid | isotonic |
| Phospholipids in the cell membrane form a bi-layer with hydrophobic _______ facing each other and the hydrophilic head of each lipid molecule facing H2O. | fatty acid tails |
| Transport proteins are like special (selective) doors that allow certain substances to cross the _________. | cell membrane |
| Active transport requires ATP to fuel (power) the movement of a molecule through a ______ in the cell membrane. | transport protein |
| Cells must continually ______ from their environment build ATP | get energy |
| All enzymes are ____ which means they can speed up one kind of reaction in a pathway. | specific |
| ________ is greatly lowered when an enzyme catalyzes a reaction | activation energy |
| If a cell does not maintain homeostasis, enzymes can be ______ (shaped ruined) so they can no longer function. | denatured |
| Cells can control enzyme activity by __________.. | feedback mechanisms |
| __________carry (transfer) protons (H+) & electrons (e-s) in metabolic pathways | enzyme helpers (coenzymes & cofactors) |
