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Chapter 7 Biology 1

A view of the cell

QuestionAnswer
Compound Light Uses a series of lenses to magnify objects in steps. Can magnify objects up to 1500 times
Cell Theory Three main ideas: 1. All organisms are composed of one or more cells. 2. The cell is the basic unit of structure and organization of organisms. 3. All cells come from pre-existing cells.
electron microscope Uses a beam of electrons instead of light to magnify up to 500,000 times. There are two types of elector microscopes.
transition electron microscope Allows scientist to study the structures contained within a cell.
scanning electron microscope Used to scan surfaces of cells to see their three-dimensional shape.
organelles Specialized structures that have a specific function in a cell. Many, but not all organelles are surrounded by membranes.
prokaryotes Cells that do not contain membrane-bound organelles.
eukaryotes Cells that contain membrane-bound organelles.
nucleus The central membrane-bound organelle that manages or controls cellular functions
plasma membrane The flexible boundary between the cell and its environment to allow a steady supply of nutrients (glucose, amino acids, and lipids) to come into the cell no matter what the external condiditons are.
selective permability The process in which a membrane allows some molecules to pass through while keeping others out. (ex. a screen in a window)
phospholipid When a phosphate forms a fatty acid it forms this. It has a glycerol backbone, two fatty acid chains, and a phosphate group.
fluid mosiac model The model of the plasma membrane.
transport protiens Moves needed substances or waste materials through the palsma membrane.
cell wall A rigid structure located outside the plasma membrane that rpovides additional support and protection.
chromatin strands of genetic material, DNA.
nucelolus A prominent organelle within the nuceleus.
Created by: kwilson1123
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