Download Life Is Cellular

Life Is Cellular
Learning Objectives




State the cell theory.
Describe how the different types of microscopes work.
Distinguish between prokaryotes and eukaryotes.
Discuss the endosymbiotic theory
The Discovery of the Cell
1665- Robert Hooke looked at slices of cork and saw something similar
to image H- called them “cells”
Anton van Leeuwenhoek was the first to observe living microorganisms.
-observed living organisms in his mouth
The Cell Theory- 3 parts
1. All living things are made up of cells.
2. Cells are the basic units of structure and function in
living things.
3. New cells are produced from existing cells.
Exploring the Cell
Most microscopes use lenses to
magnify the image of an object by
focusing light or electrons.
Electron Microscopes
The main difference between
light and electron
microscopes (EM): The
power of magnification is
much stronger in electron
microscopes
Two types of electron
microscopes:
•
Transmission- samples
must be cut into slices
•
Scanning- samples can
be viewed in 3D
Specimens cannot be LIVING
in either type of EM, but can
be living in light microscopes
Micrographs
A micrograph is a photo of an object seen through
a microscope.
Light Microscope
Transmission Electron
Microscope
Scanning Electron
Microscope
Cell Size
Certain units of measurement are used for
tiny objects, such as cells.
Prokaryotes and Eukaryotes
Nucleus
Nucleus
Cell Membrane
Cell Membrane
Cell Membrane
Endosymbiotic Theory- Origin of Eukaryotes
Ancient
photosynthetic
bacteria
Ancient
aerobic
bacteria
Nuclear
envelope
forming
Plants and
photosynthetic
unicellular
eukaryotes
Primitive
photosynthetic
eukaryote
Ancient
anaerobic
prokaryote
Mitochondrion
Primitive
aerobic
eukaryote
Animals, fungi, and
nonphotosynthetic
unicellular
eukaryotes
Review
• All living things are made up of cells.
• Cells are the basic units of structure and function in
living things.
• New cells are produced from existing cells.