Cell Structure And Function 4.1 Flashcards
Who proposed Part 1 of the Cell Theory?
Proposed by Henri Dutrochet in 1837.
Part 2 of the Cell Theory
All living organisms are composed of one or more cells.
Who proposed Part 2 of the Cell Theory
Proposed by Theodor Schwann and Matthias Schleiden in 1839.
What did Theodor Schwann work with?
Theodor Schwann worked with animal tissues.
What did Matthias Schleiden work with?
Matthias Schleiden worked with plant tissues.
Part 3 of the Cell Theory
All cells come from existing cells.
Who proposed part 3 of the cell theory?
Proposed by Rudolf Virchow in 1858.
Who invented a simple lens microscope?
Robert Hooke develops a simple lens microscope, in 1665. (It was basically like a magnifying glass.)
Who developed a compound microscope?
Anton von Leeuwenhoek develops a compound (means “more than one lens”) microscope in 1674.
What is the Main type of Microscopes used in life science today for studying cells?
Light Microscope
Light Microscope
These use lenses to magnify and direct light in relation to a specimen.
Resolution of Microscope
This term refers to the distance that two points appear as separate points. When they are so close together that they appear as one, we have lost resolution.
The benefits of the light microscope are:
We can look at living things.
They are “fairly” cheap and “fairly small”.
A drawback is……
The drawback is they have limited resolution and limited magnification.
Prokaryotic cells (pro=before; kary=nucleus)
Cells that do not have a nucleus or other membrane organelles
