https://www.khanacademy.org/science/exam-preparation-class-11th-biology/x0c1a8c25d3e07544:week-2/x0c1a8c25d3e07544:cell-the-unit-of-life/v/prokaryotic-cells 2024-05-07T04:54:08.990036301Z Prokaryotic Cells How do prokaryotic cells look like? What are their features? Watch this video to learn about prokaryotes, specifically, bacteria. Nivedhitha Suresh video https://cdn.kastatic.org/ka_thumbnails_cache/84fca487-991a-44be-8c26-3df95782edb9_1280_720_base.png Prokaryotic Cells How do prokaryotic cells look like? What are their features? Watch this video to learn about prokaryotes, specifically, bacteria. https://cdn.kastatic.org/ka-youtube-converted/7Wekk1D_QN8.mp4/7Wekk1D_QN8.mp4 540 Cell: The Unit of Life 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 Cell: The Unit of Life https://www.khanacademy.org/science/revision-term-1-ka-biology-grade-11/x1474e0ca4285b2f5:week-2/x1474e0ca4285b2f5:cell-the-unit-of-life/e/prokaryotic-and-eukaryotic-cells 2025-01-28T15:11:19.108941038Z Prokaryotic and eukaryotic cells Test your knowledge on the differences between prokaryotic and eukaryotic cells! Ashley exercise https://www.khanacademy.org/science/ap-biology/cell-structure-and-function/cell-compartmentalization-and-its-origins/v/endomembrane-system 2023-04-04T21:01:09.417661961Z Endomembrane system The endomembrane system in eukaryotic cells includes cell membrane, nuclear envelope, endoplasmic reticulum, Golgi apparatus, vesicles, vacuoles, and lysosomes. These parts, made of phospholipid bilayers, work together for protein and lipid synthesis, modification, transport, and recycling within the cell. video https://cdn.kastatic.org/googleusercontent/DA0-SUUv7ybfSANkgEEOmeXV7z4nLbeWtDurN-Z6WHv7uCoBVMb-ez6Bavwtbex5kEeeonRRJ0V8_oQS65r6KhYx Endomembrane system The endomembrane system in eukaryotic cells includes cell membrane, nuclear envelope, endoplasmic reticulum, Golgi apparatus, vesicles, vacuoles, and lysosomes. These parts, made of phospholipid bilayers, work together for protein and lipid synthesis, modification, transport, and recycling within the cell. https://cdn.kastatic.org/ka-youtube-converted/vC-cEWJxDRY.mp4/vC-cEWJxDRY.mp4 380 Cell: The Unit of Life https://www.khanacademy.org/science/mh-grade-8-science/x0f256b8de9c7cf34:cell-and-cell-organelles/x0f256b8de9c7cf34:cell-organelles/v/lysosomes-and-vacuoles 2023-01-12T07:30:45.138114799Z Lysosomes and vacuoles Let's understand the role of these tiny compartments inside our cells - Lysosomes and vacuoles. Khadijatul Qubra video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Lysosomes and vacuoles Let's understand the role of these tiny compartments inside our cells - Lysosomes and vacuoles. https://cdn.kastatic.org/ka-youtube-converted/9bMqL-9Tiow.mp4/9bMqL-9Tiow.mp4 692 Cell: The Unit of Life https://www.khanacademy.org/science/ap-biology/cell-structure-and-function/cell-structures-and-their-functions/v/mitochondria-video 2022-11-16T04:22:43.7414897Z Mitochondria Mitochondria are organelles that contain their own DNA, and have both inner and outer membranes. Mitochondria are often referred to as the "powerhouses of the cell" because they are responsible for producing most of the cell's energy in the form of ATP. According to the endosymbiont theory, mitochondria began as separate bacteria that were absorbed into another cell for their energy-producing capabilities. video https://cdn.kastatic.org/googleusercontent/S5WqTBjP99Zsg1Ymfi8hS3_dAjI2pA5Vdz43G-jCpGNNty3UH8MA-4g8716ltXjJQkjRIQr9kZ1fTgLDILB87XI Mitochondria Mitochondria are organelles that contain their own DNA, and have both inner and outer membranes. Mitochondria are often referred to as the "powerhouses of the cell" because they are responsible for producing most of the cell's energy in the form of ATP. According to the endosymbiont theory, mitochondria began as separate bacteria that were absorbed into another cell for their energy-producing capabilities. https://cdn.kastatic.org/ka-youtube-converted/i1dAnpSFbyI.mp4/i1dAnpSFbyI.mp4 861 Cell: The Unit of Life https://www.khanacademy.org/science/jnv-biology-grade-11-revision-course-full-term/x3ed1e7eacb19007a:week-2/x3ed1e7eacb19007a:cell-the-unit-of-life/v/plastids 2025-10-01T19:00:52.430915626Z Plastids Have you ever wondered how plants paint themselves in green, yellow, red, or even store food so cleverly within their own cells? Behind these secrets lies a special group of cell structures that not only adds colour but also powers life itself. What are these remarkable organelles, and how do they shape the survival of plants? Let’s step inside the hidden world of plastids to find out. Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Plastids Have you ever wondered how plants paint themselves in green, yellow, red, or even store food so cleverly within their own cells? Behind these secrets lies a special group of cell structures that not only adds colour but also powers life itself. What are these remarkable organelles, and how do they shape the survival of plants? Let’s step inside the hidden world of plastids to find out. https://cdn.kastatic.org/ka-youtube-converted/lwA6aKBCYpY.mp4/lwA6aKBCYpY.mp4 277 Cell: The Unit of Life https://www.khanacademy.org/science/jnv-biology-grade-11-revision-course-full-term/x3ed1e7eacb19007a:week-2/x3ed1e7eacb19007a:cell-the-unit-of-life/v/ribosomes 2025-10-01T19:00:52.430915626Z Ribosomes Inside every living cell, there’s a tiny machine working silently, shaping life as we know it. They don’t have membranes, they aren’t big or flashy — but without them, no organism could survive. What are these mysterious particles, and why are they so essential to life itself? Let’s uncover the fascinating story of ribosomes. Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Ribosomes Inside every living cell, there’s a tiny machine working silently, shaping life as we know it. They don’t have membranes, they aren’t big or flashy — but without them, no organism could survive. What are these mysterious particles, and why are they so essential to life itself? Let’s uncover the fascinating story of ribosomes. https://cdn.kastatic.org/ka-youtube-converted/ZDU8vHkkxWs.mp4/ZDU8vHkkxWs.mp4 294 Cell: The Unit of Life https://www.khanacademy.org/science/ap-biology/cell-structure-and-function/cell-structures-and-their-functions/e/cell-structures-and-their-functions-exercise 2026-04-05T18:28:15.377289243Z Cell structures and their functions Test your knowledge of cell structures and their functions! Ashley Mucha exercise https://www.khanacademy.org/science/jnv-biology-grade-11-revision-course-full-term/x3ed1e7eacb19007a:week-2/x3ed1e7eacb19007a:cell-the-unit-of-life/e/eukaryotic-cell-structures 2026-04-08T00:16:02.937952483Z Eukaryotic cell structures Test your knowledge on eukaryotic cell structures such as the ER, Golgi bodies, mitochondria, and cytoskeleton! Ashley exercise https://www.khanacademy.org/science/biology/structure-of-a-cell/tour-of-organelles/v/cytoskeletons 2021-06-17T20:38:53Z The cytoskeleton Exploring the cell cytoskeleton, including microfilaments and microtubules (with a brief mention of intermediate filaments). video https://cdn.kastatic.org/googleusercontent/I-72CYy4Fi3hnLjsxtgYZb5wQ0VuYXP0n9ypXYdqj_8b4hAfBQkUcE-WeWx_OiMcNTaMTJvPfvNO0dM5LL4V-fo The cytoskeleton Exploring the cell cytoskeleton, including microfilaments and microtubules (with a brief mention of intermediate filaments). https://cdn.kastatic.org/ka-youtube-converted/4BAGI6LbHeo.mp4/4BAGI6LbHeo.mp4 413 Cell: The Unit of Life https://www.khanacademy.org/science/jnv-biology-grade-11-revision-course-full-term/x3ed1e7eacb19007a:week-2/x3ed1e7eacb19007a:cell-the-unit-of-life/e/cilia-flagella 2025-07-01T05:56:27.798127633Z Cilia & Flagella Let's check our understanding of Cilia & Flagella Vandhana Ashok exercise https://www.khanacademy.org/science/jnv-biology-grade-11-revision-course-full-term/x3ed1e7eacb19007a:week-2/x3ed1e7eacb19007a:cell-the-unit-of-life/e/centrosome-centriole 2025-07-01T05:56:27.798127633Z Centrosome & Centriole Let's check our understanding of centrosome & centriole. Vandhana Ashok exercise