Welcome to Biology Notes Online! We are the BNO Team, dedicated to providing high-quality, accessible biology study notes for students and teachers alike. Our goal is to simplify complex biological concepts and present them in an easy-to-understand format, entirely free of charge. Whether you're preparing for exams, teaching a class, or simply passionate about biology, our comprehensive notes are designed to support your learning and teaching journey.
Cheek cells, fascinating eukaryotic entities, grace the lining of our mouths. These microscopic wonders boast a distinct structure that encapsulates a world of biological marvels within their tiny boundaries. Thanks to their ease of shedding, acquiring them for observation has become a simple yet enlightening endeavor. Within the confines of these small entities, a realm … Read more
Under the lens of a microscope lies a world of wonder, and one of the fascinating creatures to observe is the humble worm. These ancient beings have been roaming the earth for hundreds of millions of years, evolving into the diverse forms we see today. In 2018, an article published in National Geographic unveiled the … Read more
The Onion Peel Cell Experiment is a popular and educational activity used to observe and understand the structure of plant cells. This experiment focuses on the onion, a eukaryotic plant known for its multicellular composition. As we delve into this experiment, we explore the essential components that make up a cell, the building blocks of … Read more
What is Protists? Protists are a group of eukaryotic organisms belonging to the Kingdom Protista. They are distinct from animals, plants, and fungi. While all protists are eukaryotes with a nucleus and cellular organelles, they can vary widely in their characteristics. The majority of protists are unicellular, although there are a few multicellular protists, with … Read more
What is Salmonella? Salmonella is a group of gram-negative bacillus bacteria that is responsible for causing food poisoning and subsequent infections in the intestinal tract. While some infections can be effectively treated, there are certain strains that have developed resistance to antibiotics, making them potentially deadly. Consequently, Salmonella infections should not be underestimated and require … Read more
E. coli, short for Escherichia coli, is a versatile bacterium that can be found in a variety of environments, including certain foods, soil, and the intestines of animals, including humans. It belongs to the genus Escherichia and exhibits a wide diversity of strains. While many strains of E. coli are harmless and even beneficial, some … Read more
Features of Malignant Cells Malignant cells exhibit the following characteristics: It has been hypothesised that the immune system is partially responsible for protecting the body from the development of cancers. In addition, the presence of multiple tumours in immunocompetent individuals suggests that the immune system has a limited function in defending against cancer and is … Read more
What is Stem cell? Stem Cells Definition Stem cells are unique cells in the body that have the potential to develop into different types of specialized cells or divide to produce more stem cells. Properties of Stem Cells Stem cells possess several intrinsic properties that make them unique and give them remarkable capabilities: These properties … Read more
What is T cell (T Lymphocyte)? Definition of T cell (T Lymphocyte) T cells, also known as T lymphocytes, are a type of white blood cell that plays a crucial role in the immune system. They are responsible for recognizing and attacking foreign pathogens, infected cells, and cancer cells. T cells have specialized receptors on … Read more
What are B cells or B lymphocytes? Definition of B cell (B lymphocyte) A B cell, or B lymphocyte, is a type of white blood cell that produces antibodies and plays a crucial role in the immune response against infections. Morphology of B cell (B lymphocyte) Structure of B cell (B lymphocyte) Stage-specific Markers Antigen-binding … Read more
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