Cell Biology

Learn what the cell wall is, its structure and functions, and how plant, bacterial, fungal, algal, and archaeal cell walls differ in composition.

Learn what the cell nucleus is, how the nuclear envelope, pores, chromatin, and nucleolus are organized, and how the nucleus stores DNA and regulates essential cellular processes.

Endoplasmic reticulum (ER) is a continuous and dynamic membrane system present in the cytoplasm of eukaryotic cells. It is made up of interconnected membranous tubules and flattened sacs called cisternae, enclosing an internal space known as the ER lumen. The membrane network is spread throughout the cytoplasm. Its shape and arrangement can also change within

Learn what ribosomes are, how their rRNA-protein structure enables protein synthesis, how 70S and 80S ribosomes differ, and where ribosomes occur in cells.

Learn what centrioles are, how their ninefold microtubule structure is organized, how they differ from centrosomes, duplicate during the cell cycle, and contribute to cell division and cilia formation.

Learn what peroxisomes are, their structure and major functions in lipid metabolism and redox control, how they form, their roles in plants, and related disorders.

Learn what vacuoles are, their structure and major types, how they function in cells, and how vacuoles differ across plant, fungal, protist, and animal cells.

Cellular junctions connect cells to neighboring cells or the extracellular matrix. Learn their types, structure, proteins, functions, and examples.

Learn what plastids are, how chloroplasts, chromoplasts and leucoplasts differ, their structure, functions, development, DNA, and origin in plant cells.

Learn what cell disruption is, how mechanical, physical, chemical, and enzymatic methods work, and how cell type, product stability, scale, and downstream processing guide method selection.