1. Cell Theory 2.1
Carissa Fletcher
Inter Community School Zurich
http://upload.wikimedia.org/wikipedia/commons/3/37/Wilson1900Fig2.jpg
2. What is a scientific theory?
A scientific theory is "a well-substantiated explanation of some aspect of the natural
world, based on a body of facts that have been repeatedly confirmed through
observation and experiment.“ (http://www.nap.edu/openbook.php?record_id=6024&page=2)
3. 2.1.1 Outline Cell Theory (L2 Give a brief outline or summary)
C.Elegans
http://www.google.ch/imgres?imgurl=h
ttp://
http://www.biology.arizona.edu/cell_bio
/tutorials/cells/cells3.html
http://lensonleeuwenhoek.
net/overview.htm
Cell theory is a scientific theory that describes the properties of cells, it is one of the
foundations of Cell Biology.
The 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.
Credit for the theory is usually given to the scientists Schwann, Schleiden (1839) and Virchow (1855) (Virchow plagiarised from Remak).
4. 2.1.2 Discuss the evidence for cell theory (L3 Give an account including, where
possible, a range of arguments for and against the relative importance of various factors, or comparisons of
alternative hypotheses.)
1. When living things are observed
under the microscope they
consistently appear to be composed
of cells.
2. Cells carry out a form of cell 3. The cell is the smallest
division to form new cells. This unit of organisation that
process of cell replication in can show all the
eukaryotes is called mitosis and in http://labs.bio.unc.edu/Salmon/mit characteristics of living
osis/newnewtdic.mov
prokaryotes is called binary fission. processes. As organelles
often need other
The parental cell divides to produce organelles for successful
identical daughter cells. function.
http://www.chemgapedia.de/vsengine/vlu/vsc/en/ch/8/bc/vlu/zellbio/zellaufbau.vl
u/Page/vsc/en/ch/8/bc/zellbio/eukaryont2.vscml.html
5. 2.1.3 State that unicellular organisms carry out all the functions
of life. (L1 answer without explanation)
Euglena
Movement
Respiration
Sensitivity
Growth
Reproduction
Excretion
Nutrition
Cells
Homeostasis
http://www.buzzle.com/articles/euglen
a-facts.html
