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Questions and Answers
What did Robert Hooke observe when examining a thin slice of cork?
He observed that the cork resembled a honeycomb structure consisting of many little compartments.
In what year did Robert Hooke make his observation about cork?
1665
The word 'cell' is derived from a Latin word meaning 'a little room'.
True
What is the first step in preparing a slide of onion peel for observation under a microscope?
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What is the purpose of using safranin solution on the onion peel?
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What do we call organisms made up of a single cell?
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Which of the following are examples of multicellular organisms?
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All cells visible under a microscope in onion bulbs are different from each other.
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What did Robert Hooke observe while examining a thin slice of cork?
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The term 'cell' comes from the Latin word meaning ______.
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What is the purpose of using a cover slip when preparing a microscope slide?
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What type of organisms are Chlamydomonas, Paramecium, and bacteria?
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All multicellular organisms are made up of similar cells.
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What did Robert Hooke call the compartments he observed?
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What are some examples of multicellular organisms?
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To prepare a temporary mount of onion peel, a drop of ______ solution is used.
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Study Notes
Robert Hooke and the Discovery of Cells
- In 1665, Robert Hooke observed cork under a microscope and noted its resemblance to a honeycomb structure.
- Hooke coined the term "cells," derived from the Latin word for 'a little room.'
- This observation marked the first recognition of living things as composed of distinct units, leading to the foundational concept of cell theory in biology.
The Compound Microscope
- Hooke designed his own microscope, which featured various components:
- Eyepiece
- Coarse adjustment
- Fine adjustment
- Body tube
- Arm
- Clips
- Objective lens
- Stage
- Swivel
- Condenser
- Mirror
- The compound microscope allows for both low and high power observations of specimens.
Observing Onion Peel Cells
- A practical activity involves peeling the epidermis from an onion and observing it under a microscope.
- Safranin solution is used to stain the peel, enhancing visibility of cellular structures.
- The processed sample exhibits numerous small compartments, reinforcing the concept of cells as fundamental units of life.
Unicellular vs. Multicellular Organisms
- Unicellular organisms (including Chlamydomonas, Paramecium, and bacteria) consist of a single cell.
- Multicellular organisms are composed of many cells that group together to form complex structures and perform various functions.
- Examples of multicellular organisms include certain fungi, plants, and animals.
- Onion bulbs display similarities in cellular structure across different sizes, indicating a shared organizational pattern among multicellular organisms.
Robert Hooke and the Discovery of Cells
- In 1665, Robert Hooke observed cork under a microscope and noted its resemblance to a honeycomb structure.
- Hooke coined the term "cells," derived from the Latin word for 'a little room.'
- This observation marked the first recognition of living things as composed of distinct units, leading to the foundational concept of cell theory in biology.
The Compound Microscope
- Hooke designed his own microscope, which featured various components:
- Eyepiece
- Coarse adjustment
- Fine adjustment
- Body tube
- Arm
- Clips
- Objective lens
- Stage
- Swivel
- Condenser
- Mirror
- The compound microscope allows for both low and high power observations of specimens.
Observing Onion Peel Cells
- A practical activity involves peeling the epidermis from an onion and observing it under a microscope.
- Safranin solution is used to stain the peel, enhancing visibility of cellular structures.
- The processed sample exhibits numerous small compartments, reinforcing the concept of cells as fundamental units of life.
Unicellular vs. Multicellular Organisms
- Unicellular organisms (including Chlamydomonas, Paramecium, and bacteria) consist of a single cell.
- Multicellular organisms are composed of many cells that group together to form complex structures and perform various functions.
- Examples of multicellular organisms include certain fungi, plants, and animals.
- Onion bulbs display similarities in cellular structure across different sizes, indicating a shared organizational pattern among multicellular organisms.
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Description
Explore the fundamental unit of life in Chapter 5 of Biology. This chapter focuses on Robert Hooke's observations of cork and similarities to honeycomb structures. Learn about cell theory and the importance of cells in living organisms.
