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Unformatted text preview: Cell Biology A Tour of the Cell PDF Created with deskPDF PDF Writer - Trial :: http://www.docudesk.com Cell Biology Cell Biology is the study of individual cells & their interactions with each other. Learning Outcomes of this lecture: When you complete this lecture, you should be able to Explain Cell Theory Relate the use of microscopy in cell biology Distinguish between prokaryotic & eukaryotic cells Describe the structures of a cell P D F C r e a t e d w i th d e s k P D F P D F W r i te r- T r ia l : : h t tp : / /w w w .d o c u d e s k . c o m So what is a cell? In the 1600s, a scientist named Robert Hooke was studying a section of cork under a light microscope and saw that it was composed of tiny chambers. He coined the term cell, which comes from the Latin word cella , meaning storeroom or small container. P D F C r e a t e d w i th d e s k P D F P D F W r i te r- T r ia l : : h t tp : / /w w w .d o c u d e s k . c o m Cell Theory Over time a number of scientists including Schleiden & Schawann concluded a number of observations collectively referred to as cell theory : Very important known these! 1) All living things are composed of one or more cells 2) Cells are the smallest units of living organisms 3) New cells come from only pre-existing cells by cell division P D F C r e a t e d w i th d e s k P D F P D F W r i te r- T r ia l : : h t tp : / /w w w .d o c u d e s k . c o m Microscopy & the size range of cells Nucleus Most bacteria Measurements 1 centimeter (cm) = 10- 2 meter (m) = 0.4 inch 1 millimeter (mm) = 10 3 m 1 micrometer (m) = 10 3 mm = 10- 6 m 1 nanometer (nm) = 10 3 m = 10- 9 m 10 m 1 m 0.1 m 1 cm 1 mm 100 m 10 m 1 m 100 nm 10 nm 1 nm 0.1 nm Human height Length of some nerve and muscle cells Chicken egg Frog egg Most plant and animal cells Mitochondrion Smallest bacteria Viruses Ribosomes Proteins Lipids Small molecules Atoms Unaided eye Light microscope Electron microscope nucleus Most bacteria Most cells are microscopic but not all e.g. nerve cell can be 1 m. Most of what we know about Cells has been dependent on the development of micro- scopes. P D F C r e a t e d w i th d e s k P D F P D F W r i te r- T r ia l : : h t tp : / /w w w .d o c u d e s k . c o m INTRODUCTION TO THE CELL Microscopes provide windows to the world of the cell The light microscope (LM) Enables us to see the overall shape and structure of a cell Eyepiece Ocular lens Objective lens Specimen Condenser lens Light source P D F C r e a t e d w i th d e s k P D F P D F W r i te r- T r ia l : : h t tp : / /w w w .d o c u d e s k . c o m Light microscopes Magnify cells, living and preserved, up to 1,000 times Essentially cells are the biological building blocks of living things....
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bio1 - Cell Biology A Tour of the Cell PDF Created with...

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