Sourav Pan

Founder of Biology Notes Online, Biology & Microbiology Educator, M.Sc. in Microbiology

Expertise

Microbiology, Immunology, Cell Biology, Molecular Biology, Genetics, Biotechnology, Biochemistry, Botany, Zoology

Education

University of Calcutta

Profile Last Updated: August 10, 2026

Sourav Pan is the founder and sole author of Biology Notes Online. He holds a Bachelor of Science (B.Sc.) degree and an M.Sc. in Microbiology from the University of Calcutta. He creates educational resources covering microbiology, immunology, biotechnology, genetics, cell biology, botany, zoology, and other life-science subjects.

His goal is to make complex biological concepts easier to understand through well-structured, student-friendly articles based on academic textbooks, peer-reviewed research, and authoritative scientific sources. In addition to writing new content, he regularly reviews and updates articles to improve their accuracy, clarity, and educational value.

About the author →

Prokaryotic Cells – Definition, Structure, Characteristics, Functions and Examples

By Sourav Pan (M.Sc. in Microbiology) • Published on April 6, 2024 • Last Updated August 10, 2026 • 43 min read

Labelled diagram showing Structure of a Prokaryotic Cell

Learn what prokaryotic cells are, their structure, characteristics, DNA, ribosomes, cell wall, reproduction, examples, and differences from eukaryotic cells.

Epithelial Tissue – Definition, Characteristics, Types, Functions and Examples

By Sourav Pan (M.Sc. in Microbiology) • Published on April 6, 2024 • Last Updated August 9, 2026 • 34 min read

Epithelial Tissue Definition, Characteristics, Types, and Functions

Learn epithelial tissue definition, characteristics, structure, classification, types, functions, locations, examples, glandular epithelium and histology.

Vesicles – Definition, Structure, Types, Functions and Transport

By Sourav Pan (M.Sc. in Microbiology) • Published on April 6, 2024 • Last Updated August 9, 2026 • 35 min read

Vesicles Definition, Structure, Types and Functions

Vesicles are membrane-bound compartments that transport, store and release cellular materials. Learn their structure, types, functions, formation and vesicular transport.

Secretory Vesicles – Definition, Structure, Formation, Types, Functions and Examples

By Sourav Pan (M.Sc. in Microbiology) • Published on April 6, 2024 • Last Updated August 8, 2026 • 41 min read

Secretory Vesicles scaled 1

may contain materials that must be eliminated from the cell. These materials could be harmful to cells, such as end products of chemical reactions or waste products.

Cilia and Flagella – Structure, Functions, Differences & Examples

By Sourav Pan (M.Sc. in Microbiology) • Published on April 6, 2024 • Last Updated August 8, 2026 • 27 min read

Cilia and Flagella Definition, Structure, Function

Learn about cilia and flagella, including their axoneme structure, 9+2 arrangement, basal bodies, movement, functions, types, examples and differences.

Golgi Apparatus – Definition, Structure, Functions and Diagram

By Sourav Pan (M.Sc. in Microbiology) • Published on April 6, 2024 • Last Updated August 8, 2026 • 25 min read

Golgi Apparatus - Definition, Structure, Functions, and Diagram

Golgi apparatus is a membrane-bound organelle that modifies, sorts and packages proteins and lipids. Learn its structure, functions, cis-trans faces and diagram.

Lysosomes – Definition, Structure, Functions, Enzymes, Types and Formation

By Sourav Pan (M.Sc. in Microbiology) • Published on April 6, 2024 • Last Updated August 7, 2026 • 31 min read

Structure of Lysosomes

Learn lysosome definition, structure, enzymes, formation, types and functions, including autophagy, plant-cell equivalents and lysosomal storage diseases.

Endospore – Structure, Sporulation, Germination and Examples

By Sourav Pan (M.Sc. in Microbiology) • Published on April 6, 2024 • Last Updated August 10, 2026 • 56 min read

endospore formation

Learn what an endospore is, its structure, formation, types, resistance, germination, staining, examples and importance in medicine and food safety.

Exocytosis – Definition, Steps, Types, Functions and Examples

By Sourav Pan (M.Sc. in Microbiology) • Published on April 6, 2024 • Last Updated August 5, 2026 • 59 min read

Exocytosis Definition, Types, Steps, Examples.

Exocytosis is the vesicle-mediated release of materials from cells. Learn its steps, types, molecular mechanism, functions, examples and differences from endocytosis.

Metaphase – Definition, Stages, Applications

By Sourav Pan (M.Sc. in Microbiology) • Published on April 6, 2024 • Last Updated August 4, 2026 • 53 min read

Metaphase in Mitosis and Meiosis - Metaphase 1 and Metaphase 2

Metaphase is the stage of mitosis and meiosis when chromosomes align at the cell equator. Learn its events, checkpoint, types, diagram and significance.