Chapter 7 Cell Structure and Function Objectives Explain
Chapter 7 Cell Structure and Function
Objectives • Explain what the cell theory is. • Describe how researchers explore the living cell. • Distinguish between eukaryotes and prokaryotes.
What is a common structure that makes up every living thing?
The Discovery of the Cell • Advances in technology led to the discovery of the cell: _________________ ______.
MID-1600 s: Robert Hooke • Used an early compound microscope to look at cork. • _____________ _______ ___.
Anton van Leeuwenhoek • Used single-lens microscope to observe pond water. • _____________ _______.
CELL THEORY • Proposed by 3 scientists: –_________________: “All ___________ are made of cells” –_________: “New cells are produced only from the division of existing cells”
** Proposals were confirmed by other biologists and make up the cell theory: 1. _________________________ _____. 2. Cells are the basic units of structure an function in living things. 3. New cells are produced from existing cells.
Exploring the Cell • Microscopes are still used to explore cells. • Technology is more advanced now and more powerful microscopes have been built to observe cells. – Confocal Light Microscope –_____________________________ ___ – Scanning Probe Microscope
Confocal Light Microscope • __________________ • Makes it possible to build 3 -D images of cells and parts.
Electron Microscope • _______________ ____. • Able to reveal images 1000 times smaller than light microscopes can reveal.
Scanning Electron Microscope • ____________ ______ __ and tissues. • Cells and tissues must be placed in a vacuum.
Scanning Probe Microscope • ______________ _ • Can show samples in solution. • Can image DNA and protein molecules.
Prokaryotes and Eukaryotes • All cells have 2 characteristics in common: –_____________ ___ –______: at some point in their lives.
2 Types of Cells • Depending on whether or not they contain a nucleus: –_____________________
Prokaryotes • Smaller and simpler than eukaryotic cells. • ____________ ____________. • Bacteria
Eukaryotes • Larger and more complex than prokaryotes. • ____________ ____________. • Plants, animals, fungi, and protists.
- Slides: 18
