Ch. 7 cell structure and function Life is cellular

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Ch. 7 cell structure and function Life is cellular Important discovery in science. Revolutionized how biologist thought about living things! Basic structure of life With the invention and use of the microscope Discovery of the cell How did this happen?

Ch. 7 cell structure and function Life is cellular Microscope Two types of microscopes Devices that produces magnified images of structure too small to see with the unaided eye Compound light microscopes a. Magnifies using light rays Electron microscopes b. Magnifies using beams of electrons

What differences do you see? Compound light microscope Electron microscope

Ch. 7 cell structure and function Life is cellular History of the cell Important Scientist!!! Robert Hooke (1665) The observations and conclusions of many scientists helped develop the current understanding of the cell. Using a simple compound microscope he looked at thin slices of cork Coined the term “cells”

HOOKE described the BOXES he saw in CORK as CELLS!

Ch. 7 cell structure and function Life is cellular Anton van Leeuwenhoek (1674) Observed tiny living organisms in drops of pond water

LEEUWENHOEK saw LIFE in WATER!!!!

Ch. 7 cell structure and function Life is cellular Matthias Scheiden (1838) Theodor Schwann All PLANTS are made up of cells All ANIMALS are made up of cells

Ch. 7 cell structure and function Life is cellular Rudolph Virchow All cells come from pre-existing cells

Ch. 7 cell structure and function Life is cellular Cell Theory (a fundamental concept of biology ) Living things are made up of cells Cells are the basic unit of life New cells are produced from existing cells

Ch. 7 cell structure and function Life is cellular Two categories of cells Nucleus Prokaryotes and Eukaryotes Determined by the lack or presence of a nucleus large membrane- enclosed structure that contains the cells genetic material in the form of DNA

Ch. 7 cell structure and function Life is cellular Prokaryotes Do NOT have a nucleus “Free” DNA Single celled organisms Ex. bacteria Smaller and simpler than Eukaryotes May have flagella or cilia for mobility

Ch. 7 cell structure and function Life is cellular Eukaryotes Have a nucleus “bound” DNA Larger and more complex Ex. Plants and animals Contain many specialized structures known as organelles

Ch. 7 cell structure and function Life is cellular

Ch. 7 cell structure and function Life is cellular

Ch. 7 cell structure and function Life is cellular

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