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 Microscopy 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 https://www.khanacademy.org/science/ap-biology/cell-structure-and-function/cell-compartmentalization-and-its-origins/a/hs-prokaryotes-and-eukaryotes-review 2021-04-29T07:56:17Z Prokaryotes and eukaryotes review article https://www.khanacademy.org/science/ap-biology/cell-structure-and-function/cell-structures-and-their-functions/v/organelles-in-eukaryotic-cells 2024-05-06T19:22:43.24334365Z Organelles in eukaryotic cells Eukaryotic cells have membrane-bound organelles. The nucleus stores DNA. The endoplasmic reticulum and Golgi body are involved in protein maturation and transport. Mitochondria generate usable energy for the cell. Chloroplasts carry out photosynthesis. Vacuoles are storage compartments that sequester waste and help maintain water balance. Lysosomes contain enzymes that help break down waste. Sal Khan video https://cdn.kastatic.org/googleusercontent/TIopdlyA73KgbzUEMct36qIj-qAEliwSvP4Qa2ZhubS9JWFzHCzo0gVL1KPmq14QKAONIdR38hQ1kkO2QG-wPnt6 Organelles in eukaryotic cells Eukaryotic cells have membrane-bound organelles. The nucleus stores DNA. The endoplasmic reticulum and Golgi body are involved in protein maturation and transport. Mitochondria generate usable energy for the cell. Chloroplasts carry out photosynthesis. Vacuoles are storage compartments that sequester waste and help maintain water balance. Lysosomes contain enzymes that help break down waste. https://cdn.kastatic.org/ka-youtube-converted/bWPQvxElpLY.mp4/bWPQvxElpLY.mp4 578 Microscopy https://www.khanacademy.org/science/grade-11-biology-snc-aligned/x58c107ba92d3f0b2:domain-d-cells-and-sub-cellular-organelles/x58c107ba92d3f0b2:microscopy/v/characteristics-of-eukaryotic-cells 2023-08-17T23:33:36.770424498Z Characteristics of eukaryotic cells Eukaryotic cells, found in multicellular organisms, are defined by their compartmentalization into organelles, each with a unique function. The nucleus, a key organelle, houses genetic material. Other organelles include mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, and peroxisomes. Eukaryotic cells divide through mitosis, a more complex process than prokaryotic binary fission. Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT related content. These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video. video https://cdn.kastatic.org/googleusercontent/iPBavCUy1K1huWPZTNXigv5pOIz4a9l79h1r-XVHgrbD85wIONxBx1tl7LWGhX17hHu6qgCgLZJKefdcB3F4ca6X Characteristics of eukaryotic cells Eukaryotic cells, found in multicellular organisms, are defined by their compartmentalization into organelles, each with a unique function. The nucleus, a key organelle, houses genetic material. Other organelles include mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, and peroxisomes. Eukaryotic cells divide through mitosis, a more complex process than prokaryotic binary fission. Visit us (http://www.khanacademy.org/science/healthcare-and-medicine) for health and medicine content or (http://www.khanacademy.org/test-prep/mcat) for MCAT related content. These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video. https://cdn.kastatic.org/ka-youtube-converted/7FN1NBoV2u0.mp4/7FN1NBoV2u0.mp4 535 Microscopy https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:cells-and-organisms/x0c5bb03129646fd6:cell-parts-and-functions/v/cell-parts-and-their-functions 2024-01-04T21:34:20.525650636Z Cell parts and their functions Within cells, special structures are responsible for particular functions. For example, mitochondria help release energy that the cell can use for other tasks, and the nucleus contains the genetic information. The cell membrane forms the boundary that controls what enters and leaves the cell. In plant cells, chloroplasts enable photosynthesis and the cell wall provides structure. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/e8f3dd93-e6ed-4a18-9eb6-ccba71d3314c_1280_720_base.png Cell parts and their functions Within cells, special structures are responsible for particular functions. For example, mitochondria help release energy that the cell can use for other tasks, and the nucleus contains the genetic information. The cell membrane forms the boundary that controls what enters and leaves the cell. In plant cells, chloroplasts enable photosynthesis and the cell wall provides structure. https://cdn.kastatic.org/ka-youtube-converted/TVxtlfUwIY0.mp4/TVxtlfUwIY0.mp4 254 Microscopy https://www.khanacademy.org/science/ap-biology/cell-structure-and-function/cell-compartmentalization-and-its-origins/a/intro-to-eukaryotic-cells 2021-04-29T07:59:11Z Intro to eukaryotic cells Overview of eukaryotic cells and how they differ from prokaryotic cells (nucleus, organelles, and linear chromosomes). article https://www.khanacademy.org/science/biology/structure-of-a-cell/cytoskeleton-junctions-and-extracellular-structures/v/overview-of-animal-and-plant-cells 2023-09-14T11:07:34.466749579Z Overview of animal and plant cells Animal and plant cells share common elements like plasma membranes, cytoskeletons, and mitochondria. However, they differ in certain aspects. For example, plant cells have a cell wall and a central vacuole, while animal cells contain centrosomes. The understanding of these cellular structures continues to evolve through ongoing research. Sal Khan video https://cdn.kastatic.org/googleusercontent/Dh9U2y3gOBCqEcO6KDSA71WvDYk_M0h8RMeLhY_JkocdVEkA5NRNcJwYO9m1MyaAoYiLJh3n98UfMHvyAM00zJ0 Overview of animal and plant cells Animal and plant cells share common elements like plasma membranes, cytoskeletons, and mitochondria. However, they differ in certain aspects. For example, plant cells have a cell wall and a central vacuole, while animal cells contain centrosomes. The understanding of these cellular structures continues to evolve through ongoing research. https://cdn.kastatic.org/ka-youtube-converted/24YMQ9GvLss.mp4/24YMQ9GvLss.mp4 522 Microscopy https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:cells-and-organisms/x0c5bb03129646fd6:cell-parts-and-functions/v/comparing-animal-and-plant-cells 2022-10-21T22:40:33.613234713Z Comparing animal and plant cells Plant cells have a cell wall in addition to a cell membrane, whereas animal cells have only a cell membrane. Plants use cell walls to provide structure to the plant. Plant cells contain organelles called chloroplasts, while animal cells do not. Chloroplasts allow plants to make the food they need to live using photosynthesis. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/56d3be07-e2e3-4665-9da5-d5ced92c2ef9_1280_720_base.png Comparing animal and plant cells Plant cells have a cell wall in addition to a cell membrane, whereas animal cells have only a cell membrane. Plants use cell walls to provide structure to the plant. Plant cells contain organelles called chloroplasts, while animal cells do not. Chloroplasts allow plants to make the food they need to live using photosynthesis. https://cdn.kastatic.org/ka-youtube-converted/HjC-eMiMDfo.mp4/HjC-eMiMDfo.mp4 237 Microscopy