The Development of Cell Theory: Key Scientists and Contributions

Flashcards covering the historical development, key scientists, and major postulates of Cell Theory as presented in the lecture.

What is the definition of Cell Theory according to the notes?

A scientific theory that describes the fundamental characteristics of cells and their role in living organisms.

What are the three main postulates of Cell Theory?

1. All living organisms are made up of one or more cells. 2. The cell is the basic unit of structure and function in living things. 3. All cells arise from pre-existing cells.

In 1665, what did Robert Hooke observe using a compound microscope?

A thin slice of cork which contained tiny box-like compartments.

Why did Robert Hooke choose the term "cells" for his discovery?

The compartments reminded him of the small rooms occupied by monks.

What is the title of the book published by Robert Hooke (1635–1703)?

Micrographia.

What limitation existed in Robert Hooke's initial observation of cells?

He observed only dead plant cells.

What was the major contribution of Antonie van Leeuwenhoek (1632–1723)?

He improved microscope lenses to achieve greater magnification and was the first to observe living cells.

What name did Antonie van Leeuwenhoek give to the tiny living organisms he discovered?

Animalcules.

Which types of samples did Antonie van Leeuwenhoek use to find bacteria and protozoa?

Pond water and dental plaque.

What was the specific conclusion made by German Botanist Matthias Schleiden in 1838?

All plants are composed of cells, making the cell the basic unit of plant structure.

What did American Scientist Theodor Schwann conclude in 1839?

All animals are made of cells, extending the work of Schleiden.

How did Theodor Schwann's work impact the study of biology?

It unified the study of plants and animals under a common cellular framework.

What famous Latin statement did Rudolf Virchow (1821–1902) propose in 1855, and what does it mean?

"Omnis cellula e cellula," which means "Every cell comes from another cell."

What theory about the origin of life did Rudolf Virchow reject?

The idea of spontaneous generation.

Which scientist is credited with providing the work that led to the third postulate and the modern version of Cell Theory?

Rudolf Virchow.

According to the timeline, what was the specific discovery made in 1674?

Antonie van Leeuwenhoek observed living microorganisms.

What are the four reasons why Cell Theory is considered significant in modern science?

1. Explains basic organization of living things; 2. Provides a foundation for studying biology; 3. Helps understand growth, reproduction, and disease; 4. Supports advances in medicine, biotechnology, and genetics.