7-1 Life is Cellular.

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Presentation transcript:

7-1 Life is Cellular

What is a Cell Smallest unit of structure making up every living thing. What does this mean? Can’t be considered “living” unless you have the properties of at least one cell Lowest common denominator of all living things – the cell Development of Cell Theory

The Cell Theory Historically, how did it develop? Anton van Leeuwenhoek (1600) developed the microscope and saw tiny living organisms in a drop of water learned to grind lenses and put them to together in combinations to magnify things was a businessman who originally developed microscope to examine threads 1st to see blood cells, bacteria, sperm cells

The Cell Theory Robert Hooke (1665) looked at cork under microscope and thought they looked like tiny chambers first to coin the term “cells” – in reference to monastery rooms called cells

The Cell Theory Mathias Schleiden (1838) Concluded that all plants are made of cells

The Cell Theory Theodor Schwann (1839) Concluded that all animals made of cells

The Cell Theory Rudolph Virchow (1855) Observed cells dividing and replicating concluded that all cells come from pre-existing cells

Basic Cell Structures Despite a variety of sizes, shapes, and specific cell roles, certain structures are common to almost all cells: Cell membrane (all cells) Cytoplasm (all cells) Cell wall (many cells, notable exception are animals) Nucleus (most cells, notable exception prokaryotes – bacteria)

Basic Cell Structures Cell Membrane – thin flexible barrier around cells. Cell Wall – a strong layer around the cell membrane Nucleus – contains the cells genetic material and controls cell activities Cytoplasm – material inside the cell, NOT including nucleus

Prokaryotes and Eukaryotes A way of classifying cells Prokaryotes Cells that lack a nucleus Bacteria, e. coli, staph Eukaryotes (you are a eukaryote) Cells contain a nucleus AND usually specialized structures called organelles Plants, animals, fungi, and many microorganisms

Prokaryotic and Eukaryotic Cells Section 7-1 Cell membrane Cytoplasm Prokaryotic Cell Nucleus Eukaryotic Cell Organelles Go to Section:

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