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Showing posts from June, 2024

Eukaryotic cell Class 9

 Eukaryotic cell Eukaryotic cells are complex, membrane-bound structures that make up the fundamental units of life in organisms classified under the domain Eukarya. These cells are characterized by their compartmentalization into various membrane-bound organelles, each performing specific functions essential for the cell's survival and reproduction. Here’s a comprehensive description of eukaryotic cells: 1. Cell Structure:    - Cell Membrane: Surrounds the cell, regulating the passage of materials in and out.    - Cytoplasm: Gel-like substance filling the cell and containing organelles.    - Nucleus: Houses the genetic material (DNA) organized into chromosomes. 2. Organelles:    - Endoplasmic Reticulum (ER): Rough ER (with ribosomes) synthesizes proteins; smooth ER synthesizes lipids.    - Golgi Apparatus: This Organelle Modifies, sorts, and packages proteins and lipids for secretion or delivery to other organel...

Difference between plant cell and animal cell

  Difference between plant cell and animal cell Cells are the fundamental and the basic structural and functional units of all living organisms. While both plant and animal cells share some similarities in structure and function, they also exhibit significant differences that reflect their respective roles in different biological systems. Here’s a comprehensive look at the distinctions between plant cells and animal cells: Structure and Composition: 1. Cell Wall:    - Plant Cell: Plant cells are characterized by the presence of a rigid cell wall primarily composed of cellulose. This Cell wall gives structural support and protection to the cell.    - Animal Cell: Animal cells lack a cell wall. Instead, they are surrounded by a flexible plasma membrane that maintains cell shape and regulates movement of substances in and out of the cell. 2. Shape:    - Plant Cell: Plant cells are typically rectangular or square in shape due to the rigi...

What is a cell

Table of Contents The discovery of the cell 2 Parts of a cell   What is a cell in biology ? In biology, a cell is the basic structural, functional, and biological unit of all known living organisms. Cells are often called the "building blocks of life." because they are the smallest units of life that can function independently and perform all the necessary functions of living organisms. They are microscopic units that contain various organelles and genetic material (DNA or RNA) enclosed within a membrane. Cells perform a variety of functions depending on their type and the organism they belong to. These functions include metabolism, growth, reproduction, and responding to stimuli from the environment. Cells can be grouped into two broad categories based on their structural complexity: prokaryotic cells, which lack a nucleus and membrane-bound organelles, and eukaryotic cells, which have a nucleus and membrane-bound organelles. Here are some key points abou...