The Basics: What Is a Cell? At its core, a cell is the smallest structural and functional unit capable of carrying out life processes. Cells vary widely in size, shape, and function, but they all share certain structural features that enable them to perform essential tasks like growth, reproduction, and energy production. There are two primary types of cells: prokaryotic (found in bacteria and archaea) and eukaryotic (found in plants, animals, fungi, and protists). Prokaryotic cells are simpler, lacking a defined nucleus, while eukaryotic cells are more complex, with specialized organelles. Let’s dive into the key components of a typical eukaryotic cell and explore how their structure supports their function. The Cell Membrane: The Gatekeeper The cell membrane, a thin, flexible barrier, surrounds every cell, acting as its gatekeeper. Composed of a phospholipid bilayer embedded with proteins, it regulates what enters and exits the cell, maintaining internal balan...
Cell Cycle and Cell Division – Class 11 NCERT Biology Notes NCERT Concepts • Mitosis • Cell Cycle • NEET Biology 📚 Quick Summary Cell Cycle and Cell Division Class 11 is an important Biology topic because it explains how cells grow, duplicate their genetic material and produce new cells. The cell cycle consists mainly of Interphase and the M phase . Interphase includes G1, S and G2 phases, while the M phase involves nuclear division followed by cytokinesis. These notes are designed for Class 11 NCERT Biology revision, CBSE preparation and NEET Biology practice . 🎯 Preparing for NEET Biology? Read the relevant NCERT Biology text carefully and focus on the sequence of events, chromosome behaviour, DNA replication and differences between mitosis and meiosis. Revision formula: Concept → Diagram → Sequence → Comparison → MCQs 1. Cell Cycle and Cell Division: The Basic Idea The cell cycle is the sequence of events by which...