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16 de abr. de 2024 · Nucleus, in biology, a specialized structure occurring in most cells (except bacteria and blue-green algae) and separated from the rest of the cell by a double layer, the nuclear membrane. The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes.
- The Editors of Encyclopaedia Britannica
19 de abr. de 2024 · Definition. The cell membrane, also called the plasma membrane, is found in all cells and separates the interior of the cell from the outside environment. The cell membrane consists of a lipid bilayer that is semipermeable. The cell membrane regulates the transport of materials entering and exiting the cell.
19 de abr. de 2024 · A nucleus, as related to genomics, is the membrane-enclosed organelle within a cell that contains the chromosomes. An array of holes, or pores, in the nuclear membrane allows for the selective passage of certain molecules (such as proteins and nucleic acids) into and out of the nucleus.
8 de abr. de 2024 · The cell cycle is the process a cell undertakes to replicate all of its genetic material and divide into two identical cells. In this article, we will look at the different stages of this and what happens in each stage. We will also consider the regulation of the cell cycle, and look at some examples of its dysregulation.
16 de abr. de 2024 · Plant cell, the basic unit of all plants. Plant cells, like animal cells, are eukaryotic, meaning they have a membrane-bound nucleus and organelles. Their characteristic cell wall is composed of cellulose, and they contain chloroplasts for photosynthesis.
- The Editors of Encyclopaedia Britannica
17 de abr. de 2024 · DNA sensing and repair systems unexpectedly team up against cancer. DNA in the cytoplasm can be a sign of abnormalities such as viral infections or cancer. A protein with a role in DNA-damage ...
11 de abr. de 2024 · protoplasm, colorless ground substance of living material within cells, constituting the cytoplasm and organelles of a cell, particularly the nucleus. Protoplasm serves as the substance in which all reactions of living cells are carried out, and thus it is essential to all living processes.
