Chapter 7.1

Microscope

&

Cell

Microscope

A microscope is an instrument used to make small objects look larger.

Three Types of Microscopes

Simple Microscope: only has one lens.

Compound Light Microscope: uses series of light and lenses to magnify

objects

Electron Microscope: Uses a magnetic field to bend the beam of an electron

MicroscopeA

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Microscope Parts

The Cell Thoery• Robert Hooke – studied cork cells• Schleiden – plant cell• Schwann – animal cell• Cells – basic building blocks of all living things

– 1. All organisms composed of 1 or more cells– 2. Cells are the basic unit of organization of

organisms– 3. All cells come from preexisting cells

Prokaryote Cells

• Unicellular organisms that lack membrane-bound organelles– Example: Bacteria & Archaea

Eukaryote Cells

• Contain a nucleus and membrane-bound organelles– Examples: Animals, Plants, Fungi

Organelles – membrane bound structures with in eukaryotic cells, each organelle has a specific function for cell survival

Similarities vs. Differences

• cell membranes• ribosomes• Both have genetic

material/DNA• cytoplasm

• Eukaryotic cells have a nucleus, which contains the genetic material.

• The DNA in prokaryotic cells floats freely in the cell.

• Eukaryote cells have

membrane bound organelles.

• Eukaryotic Cells are on

average ten times larger than Prokaryotic cells.