Development of Cell Theory and Other Theories About the Origin of Life

Zacharias Jansen, 1600s

A dutch lens maker invented one of the microscope’s first prototype in the year ____

Robert Hooke, 1665

Reported some first clear drawings of the plant cells he had observed in thin slices of cork

Monks

The many boxlike structures reminded him of the blocks of cells occupied by the _____

1672

There was no indication of the materials within the cells because of the limited magnification of the microscope and then the poor technique in the preparation of cells for observation restricted the study of the cell and its contents

Anton Van Leeuwenhoek, 1673

The world of unicellular organisms was opened up. He reported his discovery of blood cells, sperm cells, and a lively world of “animalcules”

Animalcules

It was later found to be bacteria and protozoans

Cell theory, 200 years

This theory was only formulated after nearly ___ years since the introduction of microscopy

Lorenz Oken, 1805

He postulated in ____ that all organisms originate from and consist of cells. This became the initial statement of the modern cell theory

Robert Brown, 1833

He discovered the nucleus in ____ as a constant part of the plant cells and later on found and observed in some animal cells

Felix Dujardin, 1835

A french biologist who first recognized the living substance within the cell in ____

Sarcode

The living substance within the cell is termed as ______

Jan Evangelista Purkije, Protoplasm

A Czech physiologist who later changed the term sarcode to _________, referring to the colloidal substance in the cell

Matthias Schleiden, Theodore Schwann, 1838-1839

Between ____ and ____, a german botanist _______ and a german zoologist concluded that cells are elementary particles of both plants and animals

Rudolf Virchow, 1858

A subsequent study of the cell was made by a German pathologist in ______. He concluded that the cell is the basic and structural unit of life and that every cell is formed from a preexisting cell

Creation theory

Derived from Genesis 1:26 in the bible

Mechanical Scheme of creation, Anaximander

Moisture

Spontaneous generation, Aristotle

Non living to living things

Biogenesis theory, Francesco Redi

Cow meat experiment on a jar, posits that all living organisms originate from other living organisms, and not from non-living matter

Cosmozoa theory, Svante Arrhenius

Spore bearing entities

Chemical theory, J. Hadine and Alexander Oparin

Living thing developed by chemical evolution

Organic chemical evolution theory

The first forms of living cells evolved from protocells to polymerization of organic molecules to protocells replicated into the first true living cells

Polymerization

Where small molecules called simple monomers combine to form larger molecules called polymers

Heterotroph theory, Alexander Oparin

first life forms were heterotrophs that obtained their nutrition from organic molecules already present in their environment