BC: Cell theory is really important because it provided, and still provides a unifying theory in biology. One that says in spite of all the vast diversity of organisms, they are are united at the lowest level; the presence of cells.
FC: The Cell Theory | cell theory
1: Rudolph Virchow was a very important figure in the discovery of the Cell theory. Mr. Virchow came up with the theory that all cells come from existing cells. His aphorism: 'omnis cellula e cellula' Literally means "all cells from pre-existing cells". This saying summarizes what is called the cell theory. | "omnis cellula e cellula"
2: Robert Hooke was an English scientist who looked at cork through a compound microscope and observed tiny room-like structures that reminded him of the "cells" that monks lived in. Therefore these structures became known as cells. The cork cells where not alive so he only saw the cell wall. The term cells stuck and Hooke gained credit for discovering the building blocks of all life. Hooke calculated the number of cells in a cubic inch to be 1,259,712,0002, and while he couldn't grasp the full effect of his discovery, he did at least appreciate the sheer number of these cells
3: Theodore Schwann was a German Biologist who viewed animal parts under a microscope and discovered that animals were made up of cells. He applied Schleiden's cell theory in plants to animals, stating that all living things are composed of cells.
4: While a professor of botany at the University of Jena, he wrote Contributions to Phytogenesis (1838), in which he stated that the different parts of the plant organism are composed of cells. He also recognized the importance of the cell nucleus, discovered in 1831 by the Scottish botanist Robert Brown, and sensed its connection with cell division.
5: the Cell theory has 3 parts: 1. living things are made up of cells 2. All cells come from pre-existing cells. 3. There is no spontaneous generation under current conditions. Today these seem self evident, but this theory actually only dates from the mid 19th century. For example, before the mid 19th century many people believed in spontaneous generation. This is the idea that living things can develop from non-living things.
6: Prokaryotes: A Prokaryote is an organism that consist of a single cell that doesn't have a nucleus or cell organelles. There are two groups: * Eubacteria - contain chemical peptidoglycen. * Archeabacteria - lack peptidoglycan and have unique lipids in membranes. Eubacteria can cause decay and disease.
7: Eukaryotes: A Eukaryote is a cell that contains a cell membrane, a nucleus and other organelles. A Eukaryote provides basic structure to living orgisms. Divides the cytoplasm and the chromosomes inside the nucleus
8: composition of Plant Cells Nucleus (contains the Chromatin), Chromatin (contains the DNA information), Nucleolus, nuclear envelope (pores), Rough ER, Smooth ER, ribosomes, central vacuole, chloroplasts,cell wall, cell membrane,lysosomes, a golgi apparatus, and mitochondria, cytoplasm.
9: composition Animal Cells | An animal cell is comprised of cell wall, cell membrane,lysosomes, a golgi apparatus, and mitochondria, ribosomes, rough ER, nucleolus, cytoplasm, nuclear envelope and smooth ER.
10: The main part of the cell that works to maintain homeostasis is the cell membrane. That's the outer wall between the cell and the rest of the body. Essentially, it's what protects the cell from outside stimuli that could disrupt a cell's homeostasis. The cell membrane acts as the gatekeeper to what goes into and leaves the cell. It is made up of mostly fats (lipids) and protein and is selectively permeable, meaning it only lets certain molecules pass through the membrane.
11: cell structures