Cell chapter

All  about  cell .

 What  is cell ?

 Types  of cell ?

 What is prokaryotic and eukaryotic  cell ? Difference  between  them?

What is nucleus 

Cell Membrane: A lipid bilayer with embedded proteins that acts as a barrier, controlling the movement of substances in and out of the cell.

Cytoplasm: A jelly-like substance inside the cell, excluding the nucleus, where various organelles are suspended.

Nucleus: The control center of the cell that houses DNA. It is surrounded by a nuclear envelope with pores that regulate the passage of molecules.

Mitochondria: Known as the powerhouse of the cell, these organelles generate most of the cell’s supply of ATP, used as a source of chemical energy.

Ribosomes: Small structures either floating freely in the cytoplasm or attached to the endoplasmic reticulum. They are the sites of protein synthesis.

Endoplasmic Reticulum (ER):

Rough ER: Studded with ribosomes and involved in protein synthesis and processing.

Smooth ER: Lacks ribosomes and is involved in lipid synthesis and detoxification.

Golgi Apparatus: Responsible for modifying, sorting, and packaging proteins and lipids for delivery to other parts of the cell or secretion outside the cell.

Lysosomes: Contain digestive enzymes to break down waste materials and cellular debris.

Peroxisomes: Contain enzymes that detoxify harmful substances and break down fatty acids.

Cytoskeleton: A network of protein fibers (microfilaments, intermediate filaments, and microtubules) that provides structural support and aids in cell movement and division.

Centrioles: Found in animal cells, these structures are involved in organizing microtubules during cell division.

Functions of a CellMetabolism: Cells carry out various biochemical reactions to maintain life, including energy production, growth, and repair.Reproduction: Cells reproduce through processes like mitosis (for somatic cells) and meiosis (for gametes).

Response to Stimuli: Cells respond to environmental changes and signals through receptors and signaling pathways.

Homeostasis: Cells maintain a stable internal environment through regulation of various factors like pH, temperature, and ion concentration.

Protein Synthesis: Cells produce proteins based on genetic instructions, essential for various cellular functions and structures

Prokaryotic Cells: Include bacteria and archaea. They lack a defined nucleus and membrane-bound organelles.Eukaryotic Cells: Include animal, plant, fungi, and protist cells. They have a defined nucleus and various membrane-bound organelles.Each cell type has specialized functions depending on the organism and its needs.