Cells “The Building Blocks of Life”

What is a Cell? The structural and functional units of all living organisms. What is a theory? A set of statements or principles devised to explain a group of facts or phenomena Based on limited information or knowledge Verified of falsified through experimentation

History of Cell Theory Robert Hooke - 1665 Anton van Leeuwenhoek 1674 Used microscope to study cross-sections of cork which he called “cells”. Anton van Leeuwenhoek 1674 Used a simple microscope to describe tiny cells and bacteria Theodor Schwann - 1839 Concludes that all animals are made of cells

Cell Theory All living things are composed of cells 2) Cells are the basic units of structure and function in living things All cells come from pre-existing cells Exceptions: Viruses - Not composed of cells - Cannot survive without a host

More about cells… Cells fall into two categories Eukaryotes – Plants, animals, fungi Cells that contain organized nuclei Prokaryotes - Bacteria Cells that contain a non-organized nuclei

Eukaryotic Cell Structure 2 Types Animal Plant Found only in plants The major parts found in both Nucleus Cell Membrane Cytoplasm Ribosome Mitochondria Cell Wall Chloroplast Allows materials to enter and exit Provides shape Provides support Carry out Photosynthesis Contains DNA Makes Protein from amino acids Makes energy