Chapter 7 cell structure Flashcards
Robert Hooke saw tiny _____ that reminded him of rooms in a _______
He called these chambers _______
Chambers
Monastery
Cells
Who in 1665 looked at a thin slice of cork under a microscope?
Robert Hooke
Robert Hooke was the first to observe?
Dead cells
Anton van Leeuwenhoek observed?
Pond water under a microscope and saw little moving things
Anton van Leeuwenhoek was the first to observe?
Living cells
and realized all living things are made of cells
Who concluded that all plants were made of cells?
Mattias Schleiden
Who stated that all animals were made of cells?
Theodor Schwann
Who concluded that new cells come only from the division of existing cells
Rudolf Virchow
What are the three statements of the cell theory
All living things are composed of cells
Cells are the basic units of structure and function in living things
New cells are produced from existing cells
All cells have TWO similar characteristics what are they?
All cells have a barrier called a cell membrane
All cells contain DNA material
Cells are divided into two broad categories what are they?
Prokaryotes and Eukaryotes
Describe Prokaryotes
Cells that do NOT contain a nucleus
They were the first cells
Usually smaller and simpler
Ex:bacteria cells
Describe Eukaryotes
Cells that do contain a nucleus
They are larger and note complex
They have membrane bound organelles
Ex:plants animals
Define light microscopes
Allow light to pass through a specimen and uses TWO lenses to form an image
Produce clear images only to a magnification of about 1000 times
They can view live specimen
Define electron microscope
Uses beams of electrons that are focused by magnetic fields
