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A social networking service is a Web site where individuals, who are defined by a profile, can interact with others. This interaction can take the form of posting messages, sharing photographs or videos, sharing links to online material, instant messaging, and so on.
Cotransport Systems
Mechanisms in cell membranes that transport two different molecules across the membrane in the same direction.
Active Transport
The movement of molecules across a cell membrane from a region of lower concentration to one of higher concentration, requiring energy.
Membrane Proteins
Proteins that are found within, or attached to, the lipid bilayer of cell membranes, playing various roles in cellular functions such as transport, signal transduction, and cell recognition.
Multicellular Organisms
Organisms composed of many cells that are specialized to perform different functions, contributing to the organism's survival and functioning.
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