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Cell Theory & Contributions of Rudolf Virchow

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Cell Theory & Contributions of Rudolf Virchow

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Questions and Answers

Which scientist is credited with the initial observation that all plants are composed of cells?

Robert Hooke

Theodore Schwann

Rudolf Virchow

Matthias Schleiden (correct)

What key observation did Theodore Schwann make regarding animal cells?

Animal cells divide to form new cells.

Animal cells are fundamentally different from plant cells.

Animal cells are the basic unit of life.

Animal cells lack a cell wall.

Animal cells contain a thin outer layer called the plasma membrane. (correct)

What is the primary difference between the cell theory as proposed by Schleiden and Schwann and the modified theory by Virchow?

Virchow was the first to observe cells under a microscope.

Virchow refuted the idea that all living organisms are composed of cells.

Virchow emphasized the importance of cell division. (correct)

Virchow proposed that cells arise spontaneously.

Virchow focused on animal cells while Schleiden and Schwann focused on plant cells.

Which of the following is NOT a fundamental principle of the modern cell theory?

All cells contain a nucleus. Signup and view all the answers

Which of the following correctly describes the contributions of Matthias Schleiden and Theodore Schwann to the development of the cell theory?

Schleiden and Schwann independently made observations that led to the cell theory. Signup and view all the answers

Why was the original cell theory considered incomplete before Rudolf Virchow's contribution?

It did not explain the origin of cells. Signup and view all the answers

What is the central idea conveyed by the phrase "Omnis cellula-e cellula"?

Cells arise from pre-existing cells. Signup and view all the answers

Study Notes

Cell Theory

In 1838, Matthias Schleiden observed that plants are composed of different kinds of cells that form plant tissues.
In 1839, Theodore Schwann studied animal cells and discovered the plasma membrane, also concluding that plant cells have a unique cell wall.
Schwann proposed that the bodies of animals and plants are composed of cells and products of cells.
Schleiden and Schwann together formulated the cell theory.

Contributions of Rudolf Virchow

In 1855, Rudolf Virchow explained that cells divide and new cells are formed from pre-existing cells, known as "Omnis cellula-e cellula".
Virchow modified the hypothesis of Schleiden and Schwann to give the cell theory its final shape.

Modern Cell Theory

All living organisms are composed of cells and products of cells.
All cells arise from pre-existing cells.

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Description

Discover the contributions of Matthias Schleiden, Theodore Schwann, and Rudolf Virchow to the cell theory, including their observations and proposals about plant and animal cells.