Cell Theory Lecture Notes

A collection of vocabulary terms based on the historical development and core postulates of Cell Theory, including key scientists and their contributions.

Cell Theory

The fundamental concept in biology that describes the basic unit of life and provides insights into the structure, function, and origin of living organisms.

Hans and Zacharias Janssen

Dutch spectacle-makers who invented the first compound microscope in the $1590\text{'s}$.

Robert Hooke

English physicist who in $1665$ observed cork cells using a compound microscope and termed the microscopic structures "Cellulae."

Cellulae

The Latin term meaning "small rooms" used by Robert Hooke to describe the structures he observed in cork.

Antonie Van Leeuwenhoek

Dutch lens maker, known as the Father of Microbiology, who first observed single-celled microorganisms (animalcules) with a magnification of $270$ to $300\text{-fold}$.

Animalcules

The term used by Antonie Van Leeuwenhoek to describe the bacteria, protozoa, and other microorganisms he observed in $1674$.

Robert Brown

Scottish botanist who in $1831$ discovered a distinct, centrally located body in plant cells which he termed the "nucleus."

Nucleus

A term coined by Robert Brown, derived from the Latin word for "kernel," to describe a structure within plant cells.

Felix Dujardin

French biologist who in $1835$ identified a gelatinous fluid in protozoans called "sarcode."

Sarcode

A life substance identified by Felix Dujardin, later recognized as the protoplasm or cytoplasm of the cell.

Jan Evangelista Purkinje

A Czech anatomist and physiologist who in $1839$ coined the term protoplasm to describe the contents of a cell.

Matthias Jacob Schleiden

German botanist who in $1838$ proposed that the cell is the basic unit of structure in plants.

Theodor Schwann

German physiologist and zoologist who in $1839$ proposed that the cell is the basic unit of structure in animals.

Rudolf Virchow

German scientist who in $1855$ stated the principle of "omnis cellula e cellula," forming the third postulate of cell theory.

Omnis cellula e cellula

A principle meaning "all cells arise from pre-existing cells."

Cell Theory Postulate 1

All living things are composed of one or more cells.

Cell Theory Postulate 2

The basic unit of life is the cell.

Cell Theory Postulate 3

All cells arise from pre-existing cells.

Modern Cell Theory (Energy)

A modern tenet stating that energy flow occurs within cells.

Modern Cell Theory (Heredity)

A modern tenet stating that heredity information (DNA) is passed on from cell to cell.

Modern Cell Theory (Composition)

A modern tenet stating that all cells have the same basic chemical composition.

Louis Pasteur

Scientist who in $1862$ proved that bacteria are able to multiply and come from other bacterial cells during his work on fermentation.

Walther Flemming

Scientist who in $1882$ conducted meticulous observations of cell division and chromosomal behavior during mitosis.

Ernst Ruska

Scientist who used several lenses in a series to invent the first electron microscope in $1931$.