https://shorturl.im/axJhKCell theory: Okay, most scientific theories have 2 components: The first describes a pattern in the natural world, while the second identifies a mechanism or process that is responsible for creating that pattern. The complete cell theory, then, can be stated as follows: All organisms are made of cells, and all cells come from preexisting cells. — Cell membrane aka plasma membrane: A membrane that surrounds a cell, separating it from the external environment and selectively regulating passage of molecules and ions into and out of the cell. — Prokaryote: It’s a member of the domain Bacteria or Archea; a unicellular organism lacking a nucleus and containing relatively few organelles or cytoskeletal components. — Eukaryote: A member of the domain Eukarya; an organism whose cells contain a nucleus, numerous membrane-bound organelles, and an extensive cytoskeleton. It can be unicellular or multicellular. — Microtubule: A long, tubular fiber, about 25 nm in diameter, formed by polymerization of tubulin protein dimers; one of the three types of cytoskeletal fibers. It’s involved in cell movement and transport of materials within the cell. — Lysosome: A small organelle in an animal cell containing acids and enzymes that catalyze hydrolysis reactions and can digest large molecules. — Lipid bilayer aka phospholipid bilayer: The basic structural element of all cellular membranes consisting of a two-layer sheet of phospholipid molecules whose hydrophobic tails are oriented toward the inside and hydrophilic heads, toward the outside. — Endocytosis: This is a general term for any pinching off the plasma membrane that results in the uptake of material from outside the cell. Includes, for example, phagocytosis, pinocytosis, etc. — Exocytosis: Secretion of intracellular molecules (e.g., hormones, collagen), contained within membrane-bounded vesicles, to the outside of the cell by fusion of vesicles to the plasma membrane. ————————————–… @Asker: It seems like your learning about cell structure and function. This is really interesting stuff. You should open your book, study and read! I do hope these definitions help you to understand the basics, but there’s much more to it. Send me an email if you need more help or clarification. 😉...
Show More