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Questions and Answers
Which scientist formulated the first part of the cell theory in 1839?
Which scientist formulated the first part of the cell theory in 1839?
- Matthias Schleiden
- Rudolf Virchow
- Theodor Schwann (correct)
- Antonie van Leeuwenhoek
Which type of cells are classified as prokaryotes?
Which type of cells are classified as prokaryotes?
- Animal cells
- Plant cells
- Unicellular organisms of the kingdom Bacteria and Archaea (correct)
- Fungi
What is a defining characteristic of a eukaryotic cell?
What is a defining characteristic of a eukaryotic cell?
- Lack of membrane-bound organelles
- Clearly defined nucleus (correct)
- Presence of ribosomes attached to the plasma membrane
- Presence of free DNA
What separates the cell interior from the outside environment in all cells?
What separates the cell interior from the outside environment in all cells?
Which scientist was a master microscope maker and perfected the design of a simple microscope?
Which scientist was a master microscope maker and perfected the design of a simple microscope?
What is the main function of cells in the human body?
What is the main function of cells in the human body?
Which scientist perfected the existing compound microscope design in 1665?
Which scientist perfected the existing compound microscope design in 1665?
What did Robert Hooke call the tiny pores he observed in a piece of cork under the microscope?
What did Robert Hooke call the tiny pores he observed in a piece of cork under the microscope?
Which type of organism is often single-celled or unicellular?
Which type of organism is often single-celled or unicellular?
What made the discovery of cells possible?
What made the discovery of cells possible?
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Study Notes
Key Figures in Cell Theory
- Matthias Schleiden formulated the first part of the cell theory in 1839, stating that all plants are composed of cells.
- Robert Hooke perfected the design of the compound microscope in 1665 and is known for observing and naming "cells" in cork.
Cell Classification
- Prokaryotic cells are classified as organisms without a nucleus, typically single-celled, such as bacteria.
- Eukaryotic cells have a defining characteristic of a nucleus that houses their DNA, and can be multicellular or unicellular.
Cell Structure and Function
- The cell membrane separates the cell interior from the outside environment in all types of cells, maintaining homeostasis.
- The main function of cells in the human body is to serve as the basic unit of life, involved in processes such as metabolism, growth, and reproduction.
Contributions to Microscopy
- A master microscope maker perfected the design of the simple microscope, which led to advancements in the observation of microscopic structures.
- The discovery of cells was made possible by the invention and improvement of microscopes, allowing scientists to see previously invisible structures.
Organism Types
- Organisms classified as unicellular or single-celled include various types of bacteria and protozoa.
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