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Learn about the definition, theory, types and organelles of cells with CBSE Class 11 Biology Notes. Find important questions, MCQs, video and FAQs on Cell The Unit of Life.
- 4 min
- Mitochondria are membrane-bound cell organelles that generate most of the chemical energy needed to power the cell’s biochemical reactions.
- Flagellum is primarily a motility organelle that enables movement and chemotaxis. In addition to motility, flagella possess several other functions...
- The Golgi apparatus is responsible for transporting, modifying, and packaging proteins and lipids into vesicles for delivery to targeted destinations.
- Different Types of Cell
- Cell Theory
- Structure of Eukaryotic Cells
- Cell Wall
- Ribosomes
- Endoplasmic Reticulum
- Golgi Complex/Golgi Apparatus
- Lysosomes
- Vacuoles
- Mitochondria
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In the human body, different types of cells are present such as hepatocytes in the liver, nephrons in the kidney, neurons in the brain, etc. The different types of cells are grouped to form tissues. These tissues perform specific functions.
In 1839, two scientists named Schleiden who was a German botanist, and Schwann who was a British zoologist, announced the cell theory. The modern theory of the cell includes- 1. Every living organism is made up of cells. 2. The cell is said to be the basic structural and functional unit of living things. 3. All cells arise from the pre-existing cel...
Plasma Membrane The plasma membrane is a dynamic, fluid-structure that is present in the external boundary of the cell and separates the interior of the cell from the outside environment. It is selectively permeable Based on the can that only allows specific solutes to pass through it. In 1972, Jonathan Singer and Garth Nicolson proposed the fluid ...
The cell wall is a rigid non-living structure that surrounds the plasma membrane. The cell wall is mostly found in plant and fungal cells that provide shape to the cell. It also protects the cell against mechanical damage or infection and also prevents the entry of unwanted macromolecules. Cell walls are important for cell-to-cell interaction and t...
Ribosomes are specialized cell organelle which is composed of RNAs and proteins hence, they are known as ribonucleoprotein. Ribosomes units come together to translate genetic information which is stored in messenger RNA (mRNA) into proteins. Functional ribosomes consist of two subunits of unequal size, known as large and small subunits where small ...
It is the largest single membrane-bound intracellular compartment which is mainly found in eukaryotic cells. It is formed by an interconnected network of closed and flattened membrane-bound structures and the membrane-enclosed sac is called the lumen. Based on the presence or absence of ribosomes, ER can be of two types i.e., rough endoplasmic reti...
It is a single membrane-bound organelle that forms a part of the endomembrane system. Golgi complex is mainly found in the cytosol of the eukaryotic cells and is made up of flattened membrane sacs known as cisternae. A Golgi stack normally contains 4-8 cisternae. Each Golgi stack has two faces- the cis face and the trans face. Both faces are also c...
It is a single membrane-enclosed organelle that contains hydrolytic enzymes that are responsible for the breakdown of various biomolecules. These hydrolytic enzymes include nucleases, proteases, lipases, glycosidases, phosphatase, phospholipases, and sulphatases. For optimal activity, the enzyme requires an acidic environment inside the lysosomes w...
Fluid-filled vesicles are known as vacuoles and are mostly found in the cytoplasmic matrix of the cell. There is a membrane that surrounds the vacuole known as tonoplast. Similar to the pH of lysosomes the lumen's pH is also acidic. Vacuoles in plant cells are larger than those in animal cells and they contain water, dissolved inorganic ions, sugar...
It is found in all eukaryotic cells and is known as a site for aerobic respiration. They are called the powerhouse of the cell because it synthesizes ATP as the energy currency of the cell. They are the double membrane-bound cell organelle that contains circular DNA molecules and ribosomes. The space present between the outer and the inner membrane...
Download free PDF of CBSE Class 11 Biology Chapter 8 notes on cell structure and functions. Learn about unicellular and multicellular organisms, microstructure of cells, and related study materials.
Cell The Unit of Life Class 11 Notes: Here, you will get Class 11 Notes for Cell The Unit of Life PDF Format for Free of Cost. You can also download Class 11 Cell The Unit of Life Handwritten and Short Notes to get higher marks.
May 3, 2024 · The notes also explain the parts of a cell, like the outer layer called the plasma membrane, the jelly-like substance inside called cytoplasm, and the control center called the nucleus. By studying these notes, you’ll get a better idea of how cells function and why they are so important in biology.
Jan 25, 2019 · Download free PDF notes on cell structure and functions for CBSE class 11 biology exams. Learn about prokaryotic and eukaryotic cells, cell membrane, transport, cell wall, plastids and more.
Download free PDF notes on cell theory, cell structure and function, prokaryotic and eukaryotic cells, and more from NCERT books for CBSE board exams. Learn about the components, organelles, and examples of cells with diagrams and definitions.
Download free PDF notes for Cell The Unit of Life class 11 notes from Toppr. Learn about cell theory, prokaryotic and eukaryotic cells, cell organelles and their functions.
