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Short Tricks: Cell - The Unit of Life Video Lecture | Tips & Tricks for NEET

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1. What is the structure of a cell?
Ans. A cell is the basic structural and functional unit of life. It is composed of various components, including the cell membrane, cytoplasm, and nucleus. The cell membrane acts as a protective barrier and controls the movement of substances in and out of the cell. The cytoplasm is a gel-like substance that fills the cell and houses various organelles. The nucleus contains the genetic material of the cell, DNA, which controls the cell's activities.
2. What is the function of the cell membrane?
Ans. The cell membrane, also known as the plasma membrane, serves multiple functions in a cell. It acts as a protective barrier, regulating the passage of substances in and out of the cell. It also helps in maintaining the cell's shape and structure. Additionally, the cell membrane plays a role in cell signaling, allowing cells to communicate with each other and respond to external stimuli.
3. What are organelles? Give examples.
Ans. Organelles are specialized structures within a cell that perform specific functions. They are like tiny organs within a cell. Examples of organelles include the mitochondria, which produce energy for the cell through cellular respiration, and the endoplasmic reticulum, which is involved in protein synthesis and lipid metabolism. Other organelles include the Golgi apparatus, lysosomes, and ribosomes.
4. What is the function of the nucleus?
Ans. The nucleus is a vital organelle in a cell that contains the genetic material, DNA. Its main function is to control the cell's activities by regulating gene expression and directing protein synthesis. The nucleus also plays a role in cell division, as it houses the chromosomes, which carry the genetic information necessary for cell replication.
5. How are cells classified?
Ans. Cells can be classified into two main categories: prokaryotic cells and eukaryotic cells. Prokaryotic cells, such as bacteria, lack a nucleus and other membrane-bound organelles. Eukaryotic cells, found in plants, animals, fungi, and protists, have a well-defined nucleus and various membrane-bound organelles. Eukaryotic cells are further classified into plant and animal cells based on their specific characteristics and organelles present.
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