biol 227 Module 3 Study Guide + Questions with
Complete Answers
Cell theory
Scientific theory describing the properties of cells
Robert Hooke
Began Scientific study of cells
All organisms are composed of 1 or more cells
Tenet 1 of cell theory
The cell is the basic unit of life
Tenet 2 of cell theory
All cells only arise from pre existing cells
Tenet 3 of cell theory
Prokaryotes
No membranes, cell wall, small, single, circular DNA
Eukaryotes
Membrane bound organelles, DNA, Larger
Cytology
study of cells
Microscopy
the use of a microscope
light microscope
, An optical instrument with lenses that refract (bend) visible light to magnify images of
specimens.
electron microscope
microscope that forms an image by focusing beams of electrons onto a specimen
transmission electron microscope
A microscope that uses an electron beam to study the internal structure of thinly sectioned
specimens. 2D
scanning electron microscope
An electron microscope used to study the fine details of cell surfaces. 3D
Common features of cells
Maintain Integrity and shape of cell, Obtain nutrients and form chemical building blocks,
disposes of waste, cell division
Spherical cell
example: cartilage cells
Cubelike cell
example: Kidney Tubule cells
column like cells
example: Intestinal cells
Cylindrical Cells
Example: skeletal muscle cells
bioncave disc cells
Example: red blood cells
Complete Answers
Cell theory
Scientific theory describing the properties of cells
Robert Hooke
Began Scientific study of cells
All organisms are composed of 1 or more cells
Tenet 1 of cell theory
The cell is the basic unit of life
Tenet 2 of cell theory
All cells only arise from pre existing cells
Tenet 3 of cell theory
Prokaryotes
No membranes, cell wall, small, single, circular DNA
Eukaryotes
Membrane bound organelles, DNA, Larger
Cytology
study of cells
Microscopy
the use of a microscope
light microscope
, An optical instrument with lenses that refract (bend) visible light to magnify images of
specimens.
electron microscope
microscope that forms an image by focusing beams of electrons onto a specimen
transmission electron microscope
A microscope that uses an electron beam to study the internal structure of thinly sectioned
specimens. 2D
scanning electron microscope
An electron microscope used to study the fine details of cell surfaces. 3D
Common features of cells
Maintain Integrity and shape of cell, Obtain nutrients and form chemical building blocks,
disposes of waste, cell division
Spherical cell
example: cartilage cells
Cubelike cell
example: Kidney Tubule cells
column like cells
example: Intestinal cells
Cylindrical Cells
Example: skeletal muscle cells
bioncave disc cells
Example: red blood cells
