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Chapter 7 review
| Term | Definition |
|---|---|
| Light Microscope (LMs) | Pass visible light through a specimen Magnify cellular structures with lenses |
| Electron Microscope (EMs) | Focus a beam of electrons through a specimen (TEM) or onto its surface. (SEM) |
| Scanning electron microscope (SEM) | Provides for detailed study of the surface of a specimen |
| Transmission electron microscope (TEM) | Provides for detailed study of the internal ultrastructure of cells. |
| Why scientists use cell fractionation | To take cells apart and separates the major organelles from one another. |
| Antony van Leeuwenhoek | Handheld light microscope First person to see the tiny protists in water. |
| Robert Hooke | 1665 observed cork pieces Tiny chambers he termed "cells" Reminded him of monastery rooms |
| 3 parts of Cell Theory | Cells are the basic unit of life. All living things are composed of cells. All cells come from cells. |
| Scientists involved in the Cells Theory | Matthias Schleiden All plants are composed of cells Theodor Schwann Concluded all animals are made of cells Rudolph Virchow All cells are produced from preexisting cells |
| Features that are common to all cells | They are bounded by a plasma membrane They contain a semifluid substance called the Cytosol/Cytoplasm They contain chromosomes They all have ribosomes |
| Prokaryotic Cells | Do not contain a nucleus Have their DNA located in a region called the nucleoid Bacteria Cells |
| Eukaryotic Cells | Contain a true nucleus, bounded by a membranous nuclear envelope Are generally quite a bit bigger than prokaryotic cells Plant and Animal Cells |