Cell Theory and Key Contributors

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Questions and Answers

Who is considered the founder of experimental biology?

Louis Pasteur

Robert Hooke

Francesco Redi (correct)

Matthias Schleiden

The fundamental unit of life according to cell theory is the atom.

False

What did Francesco Redi demonstrate in his experiments?

Maggots come from eggs of flies.

What major invention was developed between 1665 and 1838 that contributed to the discovery of cells?

Compound microscope Signup and view all the answers

An organism that consists of only one cell is referred to as a ______ organism.

unicellular Signup and view all the answers

Which principle of cell theory states that all cells have the same basic chemical composition?

Modern Cell Theory Signup and view all the answers

Robert Hooke was the first person to observe living cells under a microscope.

False Signup and view all the answers

Match the scientist with their contribution to cell theory:

Robert Hooke = First to observe cells under the microscope Louis Pasteur = Disproved spontaneous generation Matthias Schleiden = Proposed that all plants are made of cells Theodor Schwann = Proposed that all animals are made of cells Signup and view all the answers

Who invented the first primitive microscope?

Zacharias Janssen Signup and view all the answers

Cells are capable of generating from non-living matter according to cell theory.

False Signup and view all the answers

The _____ is one of the foundational principles in biology that was developed over time by various scientists.

cell theory Signup and view all the answers

Match the contributors to their contributions:

Anton Van Leeuwenhoek = Developed magnification techniques and observed living cells Robert Hooke = Coined the term 'cell' after observing cork Zacharias Janssen = Invented the first primitive microscope Compound microscope = Enabled observation of cells at greater magnifications Signup and view all the answers

What is the primary role of DNA in cells according to the modern cell theory?

To contain hereditary information. Signup and view all the answers

Which scientist is known for making his own microscope and achieving a magnification of 270x?

Anton Van Leeuwenhoek Signup and view all the answers

Cell theory is solely attributed to Anton Van Leeuwenhoek.

False Signup and view all the answers

During what century did the significant advancements in microscopy and the foundation of cell theory occur?

17th century Signup and view all the answers

Who proposed that all plants are composed of cells?

Matthias Schleiden Signup and view all the answers

Theodor Schwann contributed to the cell theory by stating that all living things are made up of cells and cell products.

True Signup and view all the answers

What significant structure did Robert Brown discover in 1833?

the nucleus Signup and view all the answers

Matthias Schleiden used a ________ microscope to study plant cells.

compound Signup and view all the answers

Match the scientist with their contribution to cell theory:

Matthias Schleiden = Proposed all plants are composed of cells Theodor Schwann = Proposed all animals are composed of cells Robert Brown = Discovered the nucleus of a cell Louis Pasteur = Did not contribute directly to cell theory Signup and view all the answers

What was the main observation made by Theodor Schwann about animal cells?

They are made up of cells. Signup and view all the answers

Schleiden discovered the nucleus of a cell.

False Signup and view all the answers

What concept is central to cell theory as proposed by Schwann and Schleiden?

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

Study Notes

Definitions and Contributions

Francesco Redi: Italian physician known as the "father of modern parasitology" who disproved spontaneous generation, demonstrating that maggots originate from fly eggs.
Zacharias Janssen: Inventor of the first primitive microscope in the early 17th century, contributing to microscopy advancements.
Robert Hooke: First to observe and name "cells" when studying cork under a microscope in the 17th century.
Matthias Schleiden: Proposed that all plants are composed of cells, significantly contributing to cell theory in the 19th century.
Theodor Schwann: Determined that all animals are composed of cells, formulating the second principle of cell theory.
Robert Brown: Scottish botanist who discovered the nucleus of a cell in 1833, adding to the understanding of cell structure.

Modern Cell Theory

Emphasizes three key principles of cell theory:
- Energy flows occur within cells.
- Hereditary information in DNA is passed from cell to cell.
- All cells share a common chemical composition.

Three Principles of Cell Theory

Principle 1: Every living organism consists of one or more cells, defined as unicellular or multicellular organisms.
Principle 2: The cell is the fundamental unit of life, representing the smallest unit of structural and functional organization in all living beings.
Principle 3: Cells arise from pre-existing cells, containing and passing hereditary material to their daughter cells during division.

Historical Context of Cell Theory

The cell theory emerged from extensive contributions by various scientists over time, showcasing the collaborative nature of scientific discovery in biology.
The invention of the microscope between 1665 and 1838 marked a crucial turning point in the discovery and understanding of cells in the biological sciences.

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Description

Test your knowledge on the foundational figures of cell theory and their groundbreaking contributions to biology. From Francesco Redi's disproval of spontaneous generation to Robert Brown's discovery of the nucleus, explore how these scientists shaped our understanding of cells.