Cell Biology

The cell cycle is a tightly regulated sequence of events that enables eukaryotic cells to duplicate their genome and divide into two daughter cells. To maintain genomic integrit...

In the life cycle of a dividing eukaryotic cell, the nuclear envelope must break up to allow chromosomes to split and be passed to daughter cells. This controlled disassembly is...

A cross section of an animal cell diagram is a two-dimensional cut that reveals the three-dimensional organization of eukaryotic structures. In everyday language, it is a planeâ...

The macronucleus in Paramecium is the larger of the two nuclei and governs everyday cellular activities. It controls metabolism, growth, and asexual reproduction by regulating g...

In mammalian cells, proteins are synthesized by ribonucleoprotein complexes called ribosomes. Two pools carry out protein production: (1) ribosomes bound to the cytosolic face o...

In skeletal, cardiac, and smooth muscle cells, calcium ions are stored primarily within a specialized endoplasmic reticulum system called the sarcoplasmic reticulum (SR). The SR...

Cellular components are the distinct molecular machines and structures inside a living cell, including organelles, membranes, and cytoskeletal elements, each performing essentia...

Microtubules in plant cells are dynamic, filamentous structures composed mainly of tubulin that form part of the cytoskeleton and support essential processes such as intracellul...

The cytoplasm is the gel-like substance inside a cell that holds organelles and supports metabolism, while ribosomes are molecular machines that assemble proteins using mRNA tem...

In eukaryotic cells, cellular respiration primarily occurs within the mitochondria, which serve as the main site for producing usable energy in the form of adenosine triphosphat...