Cell Theory Contributors & Discoveries

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Questions and Answers

What term did Robert Hooke coin during his observations of cork?

Cell (correct)

Animalcule

Microscope

Bacteria

Which scientist is known for teaching himself to make lenses and inventing early microscopes?

Robert Hooke

Louis Pasteur

Albert Einstein

Anton van Leeuwenhoek (correct)

What did Anton van Leeuwenhoek refer to the microorganisms he observed in rainwater?

Animalcules (correct)

Bacteria

Protozoa

Cells

In which way did Robert Hooke observe cells?

Using an early compound microscope Signup and view all the answers

What notable observation did Anton van Leeuwenhoek make in his experiments?

He could determine the size of unicellular organisms. Signup and view all the answers

What is one characteristic that both Robert Hooke and Anton van Leeuwenhoek shared in their contributions to biology?

Both used advanced technology for their time. Signup and view all the answers

Which observation is NOT attributed to Anton van Leeuwenhoek?

The term 'cells' from cork. Signup and view all the answers

What is Rudolf Virchow's major contribution to cell theory?

He proposed that cells arise by binary fission of pre-existing cells. Signup and view all the answers

Which statement is NOT one of the original tenets of cell theory?

Cells contain genetic material which is hereditary. Signup and view all the answers

Who is credited with beginning the scientific study of cells?

Robert Hooke Signup and view all the answers

How are cells generally viewed in the context of modern cell theory?

As the smallest units that exhibit characteristics of life. Signup and view all the answers

What does the phrase 'Omnis cellula e cellula' imply?

New cells come from pre-existing cells. Signup and view all the answers

What significant technological advancement helped in the discovery of cells in the 17th century?

Improvements in magnification technology. Signup and view all the answers

Which of the following statements reflects a misunderstanding of cell theory?

Cells can be created without pre-existing cells. Signup and view all the answers

What does modern cell theory emphasize about genetic material in cells?

Cells consist of genetic material passed down through generations. Signup and view all the answers

Who is credited with introducing the concept of Brownian movement?

Robert Brown Signup and view all the answers

What significant contribution did Theodor Schwann make to cell theory?

He extended cell theory to include animals. Signup and view all the answers

What is Sarcode, as discovered by Felix Dujardin?

A semi-transparent living substance Signup and view all the answers

What did Robert Remak dispute about Schleiden's hypothesis?

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

Which scientist was a co-founder of cell theory along with Theodor Schwann?

Matthias Jakob Schleiden Signup and view all the answers

Which scientist identified nuclei in plant cells?

Robert Brown Signup and view all the answers

What was Henri Joachim Dutrochet's contribution to the understanding of cells?

He described cells as physiological units. Signup and view all the answers

Which of the following accurately describes the findings of Matthias Jakob Schleiden?

All plants are made of cells. Signup and view all the answers

Study Notes

Cell Theory Contributors & Discoveries

Robert Hooke (1635-1703): Coined the term "cell" after observing compartments in cork; used an early compound microscope to examine plant tissue.
Anton van Leeuwenhoek (1632-1723): Developed his own microscope and observed "animalcules" (bacteria and protozoa); documented microscopic observations of various biological structures, including muscle fibers, spermatozoa, and red blood cells.
Robert Brown (1773-1858): Identified the nucleus in plant cells; described Brownian movement.
Felix Dujardin (1801-1860): Discovered sarcode (later called protoplasm), the living substance within cells.
Matthias Schleiden (1804-1881): Concluded that all plants are made of cells; a co-founder of cell theory.
Theodor Schwann (1810-1882): Extended cell theory to animals; another co-founder of cell theory.
Henri Dutrochet (1776-1847): Proposed the cell as both a structural and physiological unit of life.
Rudolf Virchow (1821-1902): Provided evidence that new animal cells arise from pre-existing cells via binary fission; stated "Omnis cellula e cellula" ("all cells from cells"); his work is a cornerstone of cell theory.
Robert Remak (1815-1865): Contributed to the understanding of cell division and disputed Schleiden's hypotheses on cell formation.

Cell Theory: Classical and Modern Postulates

Classical Cell Theory:
- All living organisms are composed of one or more cells.
- The cell is the basic unit of structure and organization in organisms.
- Cells arise from pre-existing cells.
Modern Cell Theory: Includes the classical postulates and adds:
- All living organisms are composed of trillions of cells. (Elaboration on the first postulate)
- Cells contain genetic material passed from generation to generation.
- Cell is the fundamental building block of all living organisms

Key Concepts

Cells exhibit the characteristics of life.
Cell biology is the scientific study of cells.

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Description

Test your knowledge on the key contributors to Cell Theory and their groundbreaking discoveries in biology. Learn about the pivotal roles played by scientists like Hooke, Leeuwenhoek, and Schleiden in understanding cellular structure and function.