The cell theory states that all living things are composed of cells, cells are the basic units of structure and function in living things, and new cells are produced from existing cells. The cell theory was developed through scientific experimentation and observation using improved microscopes beginning in the 1600s. Scientists like Robert Hooke, Antony van Leeuwenhoek, and Henri Dutrochet made discoveries about cell structure and function that supported the theory, and it became widely accepted after Rudolf Virchow proposed that all cells come from pre-existing cells. The cell theory continues to be supported by ongoing scientific research.

1. CELL THEORY

2. Scientific Theory
• A Scientific theory Is a well sustained explanation of some
aspects of the natural world that is acquired through the
scientific method and reputedly tested and confirmed
through observation and experimentation.

3. How A Theory Becomes Accepted
• First of all the scientist that is testing a theory would come up with a hypothesis which is something
you try to prove through testing. They would then conduct a scientific test that is non bias and also
reliable (should be a repeatable test) When you have repeated the test you compare with your other
results. Your work will then be peer reviewed to see if the work is credible.
• It originally starts with on observation that leads to a hypothesis being made.
• There are factors that can effect the test. By stopping them from happening you should try and
control the variable. Don’t be bias in your test, you can stop this by doing blind test or double blind
test. When your works gets peer reviewed they try to find flaws in the research that can come from
the different factors
• Try to get a good size of you study to try and make it as credible as you can.
• Peer review- is the evaluation of work by one or more people of similar competence to the
producers of the work (peers). It constitutes a form of self-regulation by qualified members of a
profession within the relevant field.
• A blind or blinded experiment is an experiment in which information about the test that might lead to
bias in the results is concealed from the tester, the subject, or both until after the test. Bias may be
intentional or unconscious. If both tester and subject are blinded, the trial is a double-blind trial
• Double blind- Individuals in both groups don't know whether they are getting the real treatment or
placebo (they are "blind"). Furthermore, the researchers administering placebo and real treatment
are also kept in the dark about which group is receiving which treatment (making it a "double-blind"
experiment).

4. History About Cell Theory
• The cell was discovered by Robert Hooke in 1665. Hooke first examined
slices of cork under a compound microscope and noticed that it had small
pours that he named cells. But this observation did not give any indication
about the nucleus or an other organelles that you would fine in a cell. The first
man to witness a live cell under a microscope was Antony Van Leeuwenhoek.
The idea that cells were separable into individual units was proposed by
Ludolph Christian Treviranus and Johann Jacob Paul Moldenhawer.. All of
this finally led to Henri Dutrochet formulating one of the fundamental tenets of
modern cell theory by declaring that "The cell is the fundamental element of
organization“. Cell theory is a widely accepted explination of the relationship
between cells and living things. Cell theory states: All living things or
organisms are made of cells and their products. New cells are created by old
cells dividing into two Cells are the basic building units of life.

5. How The Theory Went Through The Stages
• When Robert Hooke first found out about the small pours a scientist
named Antony Van Leeuwenhoek made a microscope that he was
able to see into a living cell. How this theory got peer reviewed was
by other scientist went further with the experiment to find out more
information about all different cells. For example in 1858, Rudolf
Virchow extended the work of Schleiden and Schwann by proposing
that all living cells must rise from pre-existing cells. This was
considered a crazy idea because everyone believe that nonliving
matter could spontaneously generate living tissue. Research like this
was made possible because better microscopes were being
developed so they were able to get I higher magnification. The cell
theory never had a true hypothesis at the start of the experiments it
developed at they found out more about cells.
• Not all parts of this theory people agreed on, some scientist believed
in cells coming from pre existing cells where as others believed in free
cell formation, this is where cells form on there own.

6. • If you still don’t really understand this theory watch this youtube clip
that helps summerise the whole theory.
• https://www.youtube.com/watch?v=4OpBylwH9DU
• Here is a table that summarises this theory in small detail to also help
get your head around it.

7. References
http://www.studyblue.com/notes/note/n/cells/deck/987557 2nd October 2014. Picture one
http://www.princeton.edu/~achaney/tmve/wiki100k/docs/Cell_theory.html 2nd October 2014. Picture two
http://science.howstuffworks.com/innovation/scientific-experiments/scientific-method4.htm 2nd October 2014
http://www.cpschools.com/Schools/OSM/theory.htm 2nd October 2014. The cell theory table
http://www.med.nyu.edu/content?ChunkIID=21849 2nd October 2014. Double blind test definition
http://en.wikipedia.org/wiki/Peer_review 2nd October 2014. Peer reviewed
http://en.wikipedia.org/wiki/Blind_experiment 2nd October 2014. Blind Test