Examlex
A chemical that is a combination of two or more different elements in fixed proportions is called a(n) ____________________.
Facilitated Transport
A process of passive transport, mediated by carrier proteins, that allows substances to move across cell membranes without expending energy.
Active Transport
The movement of molecules across a cell membrane from a lower to a higher concentration, requiring energy.
Mitochondria
Organelles within cells that are the sites of aerobic respiration, providing energy for cellular functions.
Concentration Gradient
A variation in the concentration of a substance across a distance, leading to the movement of particles from an area of high concentration to one of lower concentration.
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