Biology Cells
Terms
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- Spontaneous Generation
- living things come from non living matter
- Francesco Redi
- -1668 -disproves spontaneous generation
- Robert Hooke
- -1662 -named "cells" -1st microscope -cork
- Anton Van Leeuwenhoeck
- -1662 -1st simple microscope -bacteria
- Mathias Schleiden
- -1832 -botanist - plants are made up of plant cells
- Theodor Schwann
- -1832 -zoologist -animals are made up of animal cells
- Rudolph Virchow
- -1855 -states that all cells arise from existing cells
- Cell Theory
- 1. All living things are made up of cells 2. Cells are the basic unit of structure and function of living things 3. Cells come from pre-existing cells
- Exceptions to Cell Theory
- -Viruses -Mitochondria -Chloroplasts
- Multicellular
- -composed of many cells -tree, monkey, humas
- Unicellular
- -organism made up of only one cell -more unicellular -bacteria, fungus, protozoa, monera
- Diffusion
- -movement of molecules from high concentration to low -no energy use -reach dynamic equilibrium
- Dynamic Equilibrium
- -state in which the number of the particles entering a cell is equal to the number leaving
- Osmosis
- -diffusion of water across a membrane -concentration gradient -osmotic balance -no energy required
- Isotonic Solution
- -concentration of water is equal inside and outside -equal movement -no change in cell
- Hypotonic Solution
- -water concentration inside a cell is lower than the surrounding solution -eventually swells and bursts
- Hypertonic Solution
- -water concentration inside a cell is higher that outside -water flows out of cell -cell shrinks
- Passive Transport
- -no energy -any exchange of materials across a membrane where no energy is used -move through pores in membrane or lipid layers of membrane
- Facilitate Diffusion
- -process where carrier proteins help move materials across the membrane