What are the three parts of the cell theory?

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bandmanjoe | Middle School Teacher | (Level 2) Senior Educator

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The cell theory is an explanation of what cells are and why they exist.  The three main parts are:  1) All living things are made of cells and their products,  2) New cells are created by old cells dividing into two, and  3) Cells are the basic building units of life.  In 1665, Robert Hooke observed, with the aid of a crude compound microsope, the structure of a thin slice of cork.  The structure resembled stacks of hat boxes, or holding cells, so he called what he observed "cells".  In 1674, Anton von Leeuenhoek observed, in a sample of pond water, small animal-like creatures swimming around.  He probably was looking at Spyrogira, but he called these small organisms "animal-cules".  Theodore Schwann and Matthias Schleiden are responsible for formulating the first two parts of the cell theory, which was a scientific explanation of what these scientists had observed up to this point.  A few years later, Rudolph Virchow added the third part of the cell theory, that all things are composed of these basic building blocks called cells.

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trophyhunter1 | College Teacher | (Level 3) Senior Educator

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The cell theory was arrived at after much study of living cells due to the intellectual contributions of Matthias Schleiden who noted all plants contains cells, and in 1838 added that different parts of plants were composed of cells.  Theodor Schwann noted all living things contained cells and cell products and Rudolph Virchow, who noted that cells come from pre-existing cells. He pusblished his work in 1858 which rejected the idea of spontaneous generation, which was believed at the time. The cell theory states that 1. cells are the unit of structure of all living things 2. cells are the unit of function of living things--they carry out life processes 3. all cells come from pre--existing cells. These three scientists are credited with arriving at the cell theory. However, one cannot discount other contributers--the famous Francesco Redi experiment that proved maggots didn't come from rotten meat, but from adult lies laying eggs and the vast and detailed drawings by Anton Leeuwenhoek, who saw the cells of various living things using his early microscopes.

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loraaa | Student | (Level 2) Valedictorian

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These are the 3 parts of the cell theory...

1) Cells are the smallest units of life
2) All living organisms are made up of cells
3) All cells come from preexisting cells these are all the theories

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misskatrina | Student, Undergraduate | (Level 1) Honors

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The formulation of the cell theory is generally credited to threee scientists -- Matthias Schlieden (a botanist), Theodore Schwann (a zoologist), and Rudoplh Virchow.

They said:

1. All living things are made up of cells.

2. All living cells come from pre-existing cells.

3. The cell is the basic unit of life.

 

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adarshanurag | Student, Grade 11 | (Level 1) Valedictorian

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Cell theory was proposed by Matthias Schlieden (a botanist) and Theodore Schwann (a zoologist).

The 3 parts of the cell theory:-

1) Cells are the structural and functional units of life 
2) All living organisms are made up of cells 
3) All cells come from pre-existing cells by the process of cell division.

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user2222590 | eNotes Newbie

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  1.  cells are the basic unit of life
  2. cells come from preexisting cells
  3. cells are the smallest unit of life
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parama9000 | Student, Grade 11 | (Level 1) Valedictorian

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Cells are the basic unit of life.

Cells are the smallest unit of life.

Cells come from preexisting cells.

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acompanioninthetardis | Student, Undergraduate | (Level 1) Valedictorian

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all living things are made up of cells

cells are the smallest unit of life

cells come from preexisting cells

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jess1999 | Student, Grade 9 | (Level 1) Valedictorian

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The cell theory was formulated by two German scientists : Matthias Schleiden and Theodor Schwann

The cell theory states that :

1 . All living things are composed of cells .

2 . Cells come from other cells .

3 . Cell is the smallest basic unit of life .

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arrellbelle | Student, College Sophomore | (Level 1) Valedictorian

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The Cell Theory states that:

  1. The smallest unit of living things are cells.
  2. All living things on this earth are made from a cell or more.
  3. All cells must have come from another cell.

You can give credit to Matthias Schleiden and Theodor Schwann for coming up with the cell theory.

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zumba96 | Student, Grade 11 | (Level 3) Valedictorian

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The three parts of the cell theory are: cells are the smallest unit of life; all cells come from preexisting cells; and living thing is made up of one or more cell.

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Jyotsana | Student, Grade 10 | (Level 1) Valedictorian

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The three part of the cell theory are All living organisms are made up of cells, All cells come from pre-existing cells and Cells are the smallest units of life. 

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ayush1389 | Student, Grade 9 | (Level 1) eNoter

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The Cell Theory:

  1. Cells are the basic structural unit of the body. 1839
  2. Cells are the basic functional unit of the body. 1839
  3. All cells arise from pre-existing cells. 1857

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