https://www.khanacademy.org/science/biology/structure-of-a-cell/introduction-to-cells/v/cell-theory 2024-04-08T10:09:39.451522273Z Cell theory Hooke and Leeuwenhoek were two of the first scientists to use microscopes to study the microscopic world of cells. Hooke coined the term "cell" after observing the tiny compartments in cork, while Leeuwenhoek discovered a variety of living creatures in pond water, blood, and other samples. They contributed to cell theory, which states that 1) all living things are made of one or more cells, 2) cells are the basic unit of life, and 3) all cells come from other cells. Sal Khan video https://cdn.kastatic.org/googleusercontent/q-Xbn6mv7EiXt6WnXqIj5W6zj8y8l9-cXXi-FIa0fwGyZibGgNOElo8Zomjnb0VKQ5YvZEmT2OZNaXh46ghSVky7 Cell theory Hooke and Leeuwenhoek were two of the first scientists to use microscopes to study the microscopic world of cells. Hooke coined the term "cell" after observing the tiny compartments in cork, while Leeuwenhoek discovered a variety of living creatures in pond water, blood, and other samples. They contributed to cell theory, which states that 1) all living things are made of one or more cells, 2) cells are the basic unit of life, and 3) all cells come from other cells. https://cdn.kastatic.org/ka-youtube-converted/zk3vlhz1b6k.mp4/zk3vlhz1b6k.mp4 483 The cell parts and functions https://www.khanacademy.org/science/biology/structure-of-a-cell/introduction-to-cells/a/intro-to-cells 2021-04-29T07:48:39Z Intro to cells An introduction to cells, including the history of their discovery and the development of cell theory. article https://www.khanacademy.org/science/strengthened-shs-biology-1/x12d91beacfa56326:cell-biology/x12d91beacfa56326:the-cell-parts-and-functions/e/cell-theory-questions 2026-04-08T00:36:09.500768563Z Cell theory questions Cell theory questions Garrick Trapp exercise https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:from-cells-to-organisms/x230b3ff252126bb6:the-cellular-basis-of-life/a/cell-biology-and-microscopy 2025-11-07T05:50:37.873729281Z Cell biology and microscopy Learn about cell biology and the different types of microscopes that allow us to observe cell structure and function. article https://www.khanacademy.org/science/biology/structure-of-a-cell/introduction-to-cells/a/microscopy 2021-04-29T08:02:10Z Microscopy Introduction to microscopes and how they work. Covers brightfield microscopy, fluorescence microscopy, and electron microscopy. article https://www.khanacademy.org/science/ap-biology/cell-structure-and-function/cell-compartmentalization-and-its-origins/v/prokaryotic-and-eukaryotic-cells 2022-11-16T04:22:43.7414897Z Prokaryotic and eukaryotic cells Eukaryotic cells contain membrane-bound organelles (such as the nucleus and mitochondria), while prokaryotic cells do not. DNA in eukaryotic cells is found inside the nucleus, while DNA in prokaryotic cells is located in the cytoplasm. Eukaryotic cells are generally larger and more complex than prokaryotic cells. Eukaryotic organisms include animals, plants, fungi, and paramecia. Prokaryotic organisms include bacteria and archaea. video https://cdn.kastatic.org/googleusercontent/JzsKsXQI3JwamHPrup3tPIx1LvFuypJN7IarCsriPalsYSLciMIksgGndNkGHQ8UabCK8NZWSuh6iOMy5ku2oA4s Prokaryotic and eukaryotic cells Eukaryotic cells contain membrane-bound organelles (such as the nucleus and mitochondria), while prokaryotic cells do not. DNA in eukaryotic cells is found inside the nucleus, while DNA in prokaryotic cells is located in the cytoplasm. Eukaryotic cells are generally larger and more complex than prokaryotic cells. Eukaryotic organisms include animals, plants, fungi, and paramecia. Prokaryotic organisms include bacteria and archaea. https://cdn.kastatic.org/ka-youtube-converted/xTnNv7YplSo.mp4/xTnNv7YplSo.mp4 410 The cell parts and functions https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:from-cells-to-organisms/x230b3ff252126bb6:prokaryotic-and-eukaryotic-cells/a/prokaryotic-and-eukaryotic-cells 2025-09-18T00:00:46.231590452Z Prokaryotic and eukaryotic cells Learn about the similarities and differences between prokaryotic and eukaryotic cells. article https://www.khanacademy.org/science/strengthened-shs-biology-1/x12d91beacfa56326:cell-biology/x12d91beacfa56326:the-cell-parts-and-functions/e/eukaryotic-cell-questions 2021-06-05T01:50:18Z Eukaryotic cell questions Eukaryotic cell questions Sasha Degtyar exercise https://www.khanacademy.org/science/exam-preparation-class-11th-biology/x0c1a8c25d3e07544:week-2/x0c1a8c25d3e07544:cell-the-unit-of-life/e/cell-the-unit-of-life 2026-04-07T22:59:30.107127435Z Cell The Unit of Life This exercise is about cells, types, and parts of a cell. Nivedhitha exercise