Chapter 7.1

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The document introduces cells and their key features. It discusses how cells were first discovered and the cell theory. Cells have a cell membrane, cytoplasm, ribosomes, and DNA. Prokaryotic cells lack a nucleus and were the first life forms on Earth. Eukaryotic cells have a nucleus which contains their DNA and allows for more specialized functions.

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Features of Prokaryotic and Eukaryotic Cells

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Visual Concept: Comparing Prokaryotes and Eukaryotes

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BIO120 Concepts of Biology Unit 2 Lecture Part One: Cell Biology Microscopy Cell Structure Osmosis & Diffusion In 1665, Robert Hooke was the first person to describe a cell, because no one ever had a lens powerful enough to see one. His first specimen was a piece of cork, the cells reminded him of little rooms (cella). Hence the name. Discovering Cells Microscopy Discovering Cells Discovering Microbes Modern Light Microscopes Cell Image Electron Microscope Size of Cells Cell Structure Osmosis & Diffusion Although Hooke was the first person to see a cell, Leeuwenhoek described the most cells in about 1683. He was first to see bacteria and other microbes, because his lens was 10 times more powerful than Hooke’s. Discovering Microbes Microscopy Discovering Cells Discovering Microbes Modern Light Microscopes Cell Image Electron Microscope Size of Cells Cell Structure Osmosis & Diffusion Most modern light microscopes can magnify objects up to 400 or 1,000 times the size of what you can see with the naked eye. Some light microscopes are dissecting microscopes, which have a lower magnification, but allow biologist to examine larger objects. Modern Light Microscopes Bright Field MicroscopeDissecting Microscope Microscopy Discovering Cells Discovering Microbes Modern Light Microscopes Cell Image Electron Microscope Size of Cells Cell Structure Osmosis & Diffusion This image shows uterine cervix cells, viewed through a light microscope. The cells were obtained from a Pap smear during a gynecological exam. The cells on the left are normal. The cells on the right are infected with human papillomavirus, which can cause cervical cancer. These potential cancerous cells are bigger and appear to be dividing. The cells are blue, because they have been stained to help see them better. Cell Image Microscopy Discovering Cells Discovering Microbes Modern Light Microscopes Cell Image Electron Microscope Size of Cells Cell Structure Osmosis & Diffusion Even more powerful than a light microscope is an electron microscope. Electron microscope uses electrons instead of light to form images and can magnify images 100,000 x. The top images shows the amazing details on an ant head. The lower image shows Salmonella infecting human cells. Electron Microscope Microscopy Discovering Cells Discovering Microbes Modern Light Microscopes Cell Image Electron Microscope Size of Cells Cell Structure Osmosis & Diffusion This image summarizes the sizes of cells and their components and what can be seen by the naked eye, light microscope, and electron microscope. Size of Cells Microscopy Discovering Cells Discovering Microbes Modern Light Microscopes Cell Image Electron Microscope Size of Cells Cell Structure Osmosis & Diffusion Cells can be classified as either prokaryotes or eukaryotes depending on whether a nucleus is present or absent. Prokaryotes are .

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Chapter 7.1