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Questions and Answers
Who is considered the founder of experimental biology?
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.
The fundamental unit of life according to cell theory is the atom.
False (B)
What did Francesco Redi demonstrate in his experiments?
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?
What major invention was developed between 1665 and 1838 that contributed to the discovery of cells?
An organism that consists of only one cell is referred to as a ______ organism.
An organism that consists of only one cell is referred to as a ______ organism.
Which principle of cell theory states that all cells have the same basic chemical composition?
Which principle of cell theory states that all cells have the same basic chemical composition?
Robert Hooke was the first person to observe living cells under a microscope.
Robert Hooke was the first person to observe living cells under a microscope.
Match the scientist with their contribution to cell theory:
Match the scientist with their contribution to cell theory:
Who invented the first primitive microscope?
Who invented the first primitive microscope?
Cells are capable of generating from non-living matter according to cell theory.
Cells are capable of generating from non-living matter according to cell theory.
The _____ is one of the foundational principles in biology that was developed over time by various scientists.
The _____ is one of the foundational principles in biology that was developed over time by various scientists.
Match the contributors to their contributions:
Match the contributors to their contributions:
What is the primary role of DNA in cells according to the modern cell theory?
What is the primary role of DNA in cells according to the modern cell theory?
Which scientist is known for making his own microscope and achieving a magnification of 270x?
Which scientist is known for making his own microscope and achieving a magnification of 270x?
Cell theory is solely attributed to Anton Van Leeuwenhoek.
Cell theory is solely attributed to Anton Van Leeuwenhoek.
During what century did the significant advancements in microscopy and the foundation of cell theory occur?
During what century did the significant advancements in microscopy and the foundation of cell theory occur?
Who proposed that all plants are composed of cells?
Who proposed that all plants are composed of cells?
Theodor Schwann contributed to the cell theory by stating that all living things are made up of cells and cell products.
Theodor Schwann contributed to the cell theory by stating that all living things are made up of cells and cell products.
What significant structure did Robert Brown discover in 1833?
What significant structure did Robert Brown discover in 1833?
Matthias Schleiden used a ________ microscope to study plant cells.
Matthias Schleiden used a ________ microscope to study plant cells.
Match the scientist with their contribution to cell theory:
Match the scientist with their contribution to cell theory:
What was the main observation made by Theodor Schwann about animal cells?
What was the main observation made by Theodor Schwann about animal cells?
Schleiden discovered the nucleus of a cell.
Schleiden discovered the nucleus of a cell.
What concept is central to cell theory as proposed by Schwann and Schleiden?
What concept is central to cell theory as proposed by Schwann and Schleiden?
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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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