Cells Flashcards
Who discovered cells? How and when?
Robert Hooke discovered cells in 1665. He took a simple microscope and viewed a sample of a cork and saw little “cells”
Who saw living organisms in milk and pond water? When and how?
Anton Van Leeuwenhook discovered “animalcules” by constructing a better microscope in the late 1600s
Who said all plants are made of cells?
Mathia Schleiden in 1838
Who said all animals are made of cells?
Theodor Schwann in 1839
Who proposed the cell theory?
Rudolph Virchow
Cell theory rules:
- all living organisms are composed of one or more cells
- cells are the basic unit of structure of all living organisms
- cells arise only from previously existing cells, with cells passing copies of their genetic material to daughter cells
types of light microscopes:
what can they do?
a. mirrored compound lm
b. electric compound lm
Can see live specimens
types of electron microscopes:
what can the first two not do? what can the third do?
a. scanning e.m.
b. transmission e.m.
c. scanning tunneling e.m.
a and b: cannot view live specimens because of the electrons
c: can see atoms
what are the two basic cell types?
prokaryotic and eukaryotic
characteristics of a pyrokratic cell
- no nucleus
- unicellular bacteria
- NO membrane bound organisms
characteristics of an eukaryotic cell
- have a nucleus
- unicellular and multicellular organisms
- has membrane bound organelles
whta is the concept of polarity?
the distribution of electrical charge over the atoms joined by the bond
plasma mebrane follows the ______ __ _______.
concept of polarity
where is plasma mebrane located
on both the inside and outside of cells because we contain so much water
what does lipid bilayer do and where is it located
liquid bilayer separates in from out, is a barrier.
found in the hydrophobic and hydrophillic regions.
