Unit 4 Flashcards
What is a cell?
The smallest unit that can come out of all of life’s processes.
What is the center of a red blood cell contain?
a piece of iron that hold the oxygen
Who was the person who use a microscope to observe nature and gave cells their names? What years did they live?
Robert Hooke; 1655
Who was Anton van Leewenhoek?
-first person to see living organisms with u microscope (amebas protests) -called them animicules “little animals” today we call them protists
Who are the 3 scientist, and their discoveries, and what century were they discovered, that lead to the cell theory?
- Schleiden:Botanish:All plants are made of cells - Schwann : zoologist : all animals are made of cells - Virchow : physician : all cells come from other cells
What is the cell theory?
- All living things are made of cells 2. Cells are the basic unit structure and function 3. all cells come from preexisting cells
What is the difference inbetween a TEM and SEM; what do they stand for?
TEM- transmission electron microscope : Electron beam goes through the specimen
SEM- scanning electron microscope : Gives 3D image; electrons bounce off of the specimen covered in gold and platinum
What does a TEM show?
A cross section (slice)
What does a image of a SEM project?
a 3D image
