Module 13: Cells Flashcards
Who discovered cells?
Robert Hooke
What organisms did he think were unique to?
Little rooms
Who discovered single celled organisms?
Anton Von Leeuwenhoek
What is the cell theory?
- Cells are the basic unit of life. All Living organisms are composed of at least one cell.
- Cells come from other cells. New cells are made when one cell copies its DNA and divides.
What happens to the surface area and the volume of a cell as it gets larger? Which one increases faster?
When cells get larger the ratio of surface area to volume decreases. And volume increases faster than surface area.
About what size are most cells?
Most are between 10-5 or 10-4
Why is the resolving power of a light microscope limited, and what can be used in place of light to increase resolving power?
It is limited because it has a longer wavelength. Can be improved by using Electrons instead of light. Electrons have much shorter wavelengths than light.
What are the three different types of microscopy?
Transmission, Scanning & Fluorescence
What do Transmission electron microscopy do?
They thin slice material.
What do Fluorescence microscopy do?
Show different structures glow and are labeled.
What do Scanning microscopy do?
Look at surfaces.
Bacterial cells are?
Prokaryotic
What is the difference between a Prokaryotic and Eukaryotic cell?
Prokaryotic cells- Lack nucleus & Membrane-bound organelles.
Cell wall
Unique molecule only found in prokaryotic.
What drug is selectively toxic to prokaryotic cells
Penicillin
