The History of Cell Theory

What was the main problem with the first compound microscopes made by the Jansens?

• They were too heavy to use

• Magnified images appeared blurry

• They magnified images too much

• They were too expensive

What did Robert Hooke observe when he placed a slice of cork under his microscope?

• Protozoa

• Tiny rooms like structures

• Animal tissues

• Bacteria

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What did Anton van Leeuwenhoek observe under his microscope?

• Plant tissues

• Cork structures

• Bacteria and protozoa

• Cells

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What is the basic structural unit in biology?

• Molecule

• Organ

• Cell

• Tissue

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Who extensively worked on microscopic observations of plant tissue?

• Robert Hooke

• Anton van Leeuwenhoek

• Matthias Jacob Schleiden

• Theodor Schwann

What did Matthias Schleiden and Theodor Schwann conclude about cells?

• Cells are only found in plants

• Cells do not play a significant role in life

• Cells are the basic structural units of plants and animals

• Cells cannot be seen under a microscope

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What does the phrase 'Omnis cellula a cellula' translate to?

• Every cell from a cell

• Cells are life

• Cells within cells

• The cell is the basic unit of life

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Who is credited with the phrase 'Omnis cellula a cellula'?

• Robert Remak

• Rudolf Virchow

• Anton van Leeuwenhoek

• Robert Hooke

What does the modern cell theory include?

• Cells do not contribute to the structure of organisms

• All living organisms are made of cells and all cells come from pre-existing cells

• Cells can only be observed under a microscope

• Only plant cells are made of cells

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What theory did people believe in before the invention of the microscope?

• Spontaneous generation theory

• Cell theory

• Theory of relativity

• Quantum theory