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ShareThe cell is the structural and functional unit of all living organisms, and is sometimes called the "building block of life." Some organisms, such as bacteria, are unicellular, consisting of a single cell.
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Other organisms, such as humans, are multicellular, (humans have an estimated 100 trillion cells; a typical cell size is 10 µm, a typical cell mass 1 nanogram).
The largest known cell is an ostrich egg.
Each cell is at least somewhat self-contained and self-maintaining: it can take in nutrients, convert these nutrients into energy, carry out specialized functions, and reproduce as necessary.
Each cell stores its own set of instructions for carrying out each of these activities.
There are two types of cells, eukaryotic and prokaryotic.
Prokaryotic cells are usually singletons, while eukaryotic cells are usually found in multi-cellular organisms.
For more information about the topic Cell (biology), read the full article at Wikipedia.org, or see the following related articles:
Plant cell — There are three major classes of plant cells that can then differentiate to form the tissue structures of roots, stems, and leaves. (The three ... > read more
Organelle — In cell biology, an organelle is one of several structures with specialized functions, suspended in the cytoplasm of a eukaryotic cell. Eukaryotes ... > read more
Cell membrane — A cell membrane, plasma membrane or plasmalemma is a selectively permeable lipid bilayer coated by proteins which comprises the outer layer of a ... > read more
Embryonic stem cell — Embryonic stem cells (ESCs) are stem cells derived from the undifferentiated inner mass cells of a human embryo. Embryonic stem cells are ... > read moreEditor's Note: This article is not intended to provide medical advice, diagnosis or treatment.
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