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Cell division | Biology archive | Science | Khan Academy
This unit is part of the Biology archive. Browse videos and articles by topic. For our most up-to-date, mastery-enabled courses, check out High School Biology and AP Biology.
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Phases of mitosis | Mitosis | Biology (article) | Khan Academy
The great majority of the cell divisions that happen in your body involve mitosis. During development and growth, mitosis populates an organism’s body with cells, and throughout an …
Prokaryotic cells (article) | Khan Academy
The figure below shows the sizes of prokaryotic, bacterial, and eukaryotic, plant and animal, cells as well as other molecules and organisms on a logarithmic scale.
Bacteria (video) | Prokaryote structure | Khan Academy
Some bacteria can get around this system by hiding their cell walls, but some bacteria have evolved to lose their cell walls entirely possibly because it allows them to live undetected as …
Meiosis | Cell division | Biology (article) | Khan Academy
Since cell division occurs twice during meiosis, one starting cell can produce four gametes (eggs or sperm). In each round of division, cells go through four stages: prophase, metaphase, …
Cell-cell signaling in unicellular organisms - Khan Academy
In multicellular organisms (such as yourself), cell-cell signaling allows cells to coordinate their activities, ensuring that tissues, organs, and organ systems function correctly. Does that mean …
Foundation 2: Cells | MCAT | Test prep | Khan Academy
Cells: the basic building blocks of life! Learn about the structure of living cells and how this allows them to carry out critical functions, including homeostasis, growth and reproduction. See how …
Chromosomes (article) | Cell cycle | Khan Academy
In bacteria, most of the DNA is found in a central region of the cell called the nucleoid, which functions similarly to a nucleus but is not surrounded by a membrane.
Telomeres and telomerase (article) | Khan Academy
Telomerase is not usually active in most somatic cells (cells of the body), but it’s active in germ cells (the cells that make sperm and eggs) and some adult stem cells. These are cell types …