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Questions and Answers
What did Robert Hooke observe when examining a thin slice of cork?
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?
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'.
The word 'cell' is derived from a Latin word meaning 'a little room'.
True (A)
What is the first step in preparing a slide of onion peel for observation under a microscope?
What is the first step in preparing a slide of onion peel for observation under a microscope?
What is the purpose of using safranin solution on the onion peel?
What is the purpose of using safranin solution on the onion peel?
What do we call organisms made up of a single cell?
What do we call organisms made up of a single cell?
Which of the following are examples of multicellular organisms?
Which of the following are examples of multicellular organisms?
All cells visible under a microscope in onion bulbs are different from each other.
All cells visible under a microscope in onion bulbs are different from each other.
What did Robert Hooke observe while examining a thin slice of cork?
What did Robert Hooke observe while examining a thin slice of cork?
The term 'cell' comes from the Latin word meaning ______.
The term 'cell' comes from the Latin word meaning ______.
What is the purpose of using a cover slip when preparing a microscope slide?
What is the purpose of using a cover slip when preparing a microscope slide?
What type of organisms are Chlamydomonas, Paramecium, and bacteria?
What type of organisms are Chlamydomonas, Paramecium, and bacteria?
All multicellular organisms are made up of similar cells.
All multicellular organisms are made up of similar cells.
What did Robert Hooke call the compartments he observed?
What did Robert Hooke call the compartments he observed?
What are some examples of multicellular organisms?
What are some examples of multicellular organisms?
To prepare a temporary mount of onion peel, a drop of ______ solution is used.
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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