Cell biologyCell biology (also cellular biology or cytology) is a branch of biology that studies the structure, function, and behavior of cells. All living organisms are made of cells. A cell is the basic unit of life that is responsible for the living and functioning of organisms. Cell biology is the study of the structural and functional units of cells. Cell biology encompasses both prokaryotic and eukaryotic cells and has many subtopics which may include the study of cell metabolism, cell communication, cell cycle, biochemistry, and cell composition.
Cell cycleThe cell cycle, or cell-division cycle, is the series of events that take place in a cell that causes it to divide into two daughter cells. These events include the duplication of its DNA (DNA replication) and some of its organelles, and subsequently the partitioning of its cytoplasm, chromosomes and other components into two daughter cells in a process called cell division. In cells with nuclei (eukaryotes, i.e., animal, plant, fungal, and protist cells), the cell cycle is divided into two main stages: interphase and the mitotic (M) phase (including mitosis and cytokinesis).
First WorldThe concept of the First World was originally one of the "Three Worlds" formed by the global political landscape of the Cold War, as it grouped together those countries that were aligned with the Western Bloc of the United States. This grouping was directly opposed to the Second World, which similarly grouped together those countries that were aligned with the Eastern Bloc of the Soviet Union.
Second WorldThe Second World is one of the "Three Worlds" formed by the global political landscape of the Cold War, as it grouped together those countries that were aligned with the Eastern Bloc of the Soviet Union. This grouping was directly opposed to the First World, which similarly grouped together those countries that were aligned with the Western Bloc of the United States. It included communist states that were originally under the Soviet sphere of influence, though some eventually broke away from the Soviet ideology (e.
