The cell i

Notes

The cell is the basic unit of life. Robert Hooke (1665) studied a cork made from the bark of a tree and saw small boxes that reminded him of the small rooms where monks lived, and decided to call the boxes cells. - Anton van Leeuwenhoek (1673) observed living cells for the first time (volvox--> microscopic algae). He was able to see microscopic algae in pond water because his microscope was able to magnify things 10 times greater than Hooke's. Important Discoveries that Led to the Proposal of the Cell Theory: 1838, Matthias Schleiden stated all plants are made of cells. 1839, Theodor Schwann stated all animals are made of cells. 1840, Rudolf Virchow stated all cells come from other existing cells. Cell Theory: All living organisms are made of at least one cell. Cells are the basic unit of life. All cells come from existing cells. Characteristics of Life: 1- All living organisms are made of at least one cell (unicellular: one cell or multicellular: many cells). 2- Have levels of organization (cell-tissue-organ-organ system). 3- Reproduce (asexual: produce offspring that are identical to the parent ,or sexual: egg and sperm joining to create a differ...