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Oct 31, 2024 · Cell, in biology, the basic membrane-bound unit that contains the fundamental molecules of life and of which all living things are composed. A single cell may be a complete organism in itself, such as a bacterium, or it may acquire a specialized function, becoming a building block of a multicellular organism.
Cell nucleus: A cell's information center, the cell nucleus is the most conspicuous organelle found in a eukaryotic cell. It houses the cell's chromosomes , and is the place where almost all DNA replication and RNA synthesis ( transcription ) occur.
Mar 8, 2022 · Every cell in an organism’s body has the same DNA. Yet those cells can look and function quite differently. And here’s why: Different cell types access and use different parts of the DNA instruction book. For example, an eye cell is translating the parts of its DNA that tell it how to make eye-specific proteins.
Apr 27, 2017 · The cell wall may be enclosed by another thick “capsule” made of sugars. Many prokaryotic cells also have cilia, tails, or other ways in which the cell can control its movement. Prokaryote cell. These characteristics, as well as the cell wall and capsule, reflect the fact that prokaryotic cells are going it alone in the environment.
Dec 19, 2023 · A cell is the smallest living organism and the basic unit of life on earth. Together, trillions of cells make up the human body. Cells have three parts: the membrane, the nucleus, and the cytoplasm.
Cell biology (also cellular biology or cytology) is a branch of biology that studies the structure, function, and behavior of cells. [1] [2] All living organisms are made of cells. A cell is the basic unit of life that is responsible for the living and functioning of organisms. [3] Cell biology is the study of the structural and functional ...
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Figure 4.2.4 Every cell consists of at least a plasma membrane, DNA, ribosomes and a cytoplasm. The plasma membrane (a type of cell membrane) is a thin coat of lipids that surrounds a cell. It forms the physical boundary between the cell and its environment. You can think of it as the “skin” of the cell.
