Cellular walls, nuclei, vacuole and lysosomes are all examples of cellular organelles. Organelles are broadly classified as either mitochondria or plastids, depending on whether or not they contain DNA. Within a cell, ea... More »

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Unicellular organisms fall under the main groups of bacteria, archaea, protozoa, single-celled algae and single-celled fungi. . The two general categories are prokaryotes, which lack membrane-bound nuclei and membrane-bo... More »

Topics a biology course may cover include cellular and molecular biology, genetics, evolution, microorganisms and organ systems. Examples of other topics include heredity, ecology and interactions of biological systems. More »

Animal cells have many distinct characteristics when compared to plant cells, including their varied shapes, their many types of organelles, their centrioles, cilia and lysosomes, and their cell-to-cell junctions. Animal... More »

Cellular respiration takes place in the organelles called mitochondria. The mitochondria take in glucose, a type of sugar, and change it in the presence of oxygen into an energy-rich molecule called ATP, or adenosine tri... More »

The smooth endoplasmatic reticulums, ribosomes, vacuoles, lysosomes and centrosomes are among the numerous components of a cell that are not found in its nucleus. All of these structures are located between the nuclear a... More »

If a cell did not have lysosomes, it would potentially starve, since lysososmes contain enzymes important for digesting nutrients. This would be exacerbated by cells' inability to digest their own organelles, which they ... More »