CH 2: Molecular make up of cells

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Who discovered plant cells in 1665?

Marie Curie

Antonie van Leeuwenhoek

Robert Hooke (correct)

Louis Pasteur

What technique was introduced to enhance the visibility of internal cell structures during the evolution of microscopy?

Chemical staining (correct)

Freezing

Laser cutting

Heat treatment

In which century were cells first observed using simple magnifying devices?

17th century (correct)

16th century

19th century

18th century

What type of microscopes provided significantly improved clarity and magnification by the early 1900s?

Advanced light microscopes Signup and view all the answers

Which scientist advanced the study of microbiology by observing bacteria and single-celled organisms in the 17th century?

Antonie van Leeuwenhoek Signup and view all the answers

What revolutionary advancement in microscopy occurred in 1940?

Development of electron microscope Signup and view all the answers

What type of lenses do microscopes use to magnify objects?

'Convex' lenses Signup and view all the answers

What did Robert Hooke discover in cork in 1665?

'Cellular' structure Signup and view all the answers

What did Antonie van Leeuwenhoek observe using refined lenses?

'Single-celled organisms' and bacteria Signup and view all the answers

What is the fundamental principle of cell theory?

The cell is the smallest unit of life. Signup and view all the answers

Which type of microscope uses beams of electrons instead of light for magnification?

Transmission Electron Microscope (TEM) Signup and view all the answers

What is crucial for preserving the functionality of light microscopes?

Proper handling and maintenance Signup and view all the answers

How is magnification calculated in a light microscope?

By multiplying the magnification power of the ocular lens by that of the objective lens Signup and view all the answers

What is NOT a life function exhibited by cells according to cell theory?

Invisibility Signup and view all the answers

How are field of view and magnification related in microscopy?

As magnification increases, field of view decreases. Signup and view all the answers

Who developed cell theory in 1838?

Matthias Schleiden and Theodor Schwann Signup and view all the answers

What is used to deduce the actual size of objects in micrographs?

"Scale bars" provided in the images Signup and view all the answers

What are the essential components of a light microscope?

Ocular lens, objective lenses, light source Signup and view all the answers

What happens to the field of view as magnification increases?

Decreases Signup and view all the answers

What is the main difference between a Transmission Electron Microscope (TEM) and a Scanning Electron Microscope (SEM)?

TEM can achieve higher magnifications than SEM. Signup and view all the answers

How does magnification affect the field of view in microscopy?

Field of view decreases as magnification increases. Signup and view all the answers

Why is proper handling and maintenance crucial for light microscopes?

To preserve the functionality and precision of the microscope. Signup and view all the answers

What is the significance of the cell theory positing that 'all cells originate from pre-existing cells'?

It disproves the concept of spontaneous generation of cells. Signup and view all the answers

How do you calculate the size of objects in micrographs using scale bars?

By measuring the distance on the scale bar and converting it to actual size. Signup and view all the answers

What does cell theory propose about all living organisms?

They are composed of cells. Signup and view all the answers

Why are compound lenses used in microscopes to increase magnification?

To achieve higher magnification by combining lens powers. Signup and view all the answers

How does the field of view change as magnification increases?

'Field of view shrinks as magnification increases. Signup and view all the answers

What did Antonie van Leeuwenhoek observe using more refined lenses?

Bacteria and single-celled organisms Signup and view all the answers

What was a significant improvement brought about by the development of electron microscopes?

Higher magnification and resolution Signup and view all the answers

What was the primary purpose of using chemical stains in microscopy?

To enhance the visibility of internal cell structures Signup and view all the answers

How did Robert Hooke contribute to the field of cell biology?

Observed plant cells and noted their structure Signup and view all the answers

What role do convex lenses play in the operation of microscopes?

Magnify the observed objects Signup and view all the answers

What did early microscopes primarily reveal about cells?

Tiny, colorless, and translucent units Signup and view all the answers

Why were chemical stains introduced in the evolution of microscopy?

To enhance visibility of internal cell structures Signup and view all the answers

Which type of microscope allowed detailed visualization of organelles like mitochondria?

Electron microscope Signup and view all the answers

What did Robert Hooke specifically discover in plant cells in 1665?

Cellular structure Signup and view all the answers

What was a limitation of early microscopes regarding cellular observation?

Limited magnification and resolution Signup and view all the answers

What was the primary purpose of introducing chemical stains in the evolution of microscopy?

To enhance the visibility of internal cell structures Signup and view all the answers

Who made significant advancements in microbiology by observing bacteria and single-celled organisms using refined lenses in the 17th century?

Antonie van Leeuwenhoek Signup and view all the answers

What did early lens microscopes primarily reveal about cells?

Their lack of definition Signup and view all the answers

What revolutionary step occurred in the field of microscopy in 1940?

Invention of electron microscopes Signup and view all the answers

How do microscopes magnify objects?

By altering the size of the object Signup and view all the answers

Why are convex lenses essential for the operation of microscopes?

To magnify objects Signup and view all the answers

What technological advancement significantly improved the clarity and magnification of cellular structures by the early 1900s?

Light Microscopes Signup and view all the answers

Which scientist discovered plant cells and noted their 'cellular' structure in cork in 1665?

Robert Hooke Signup and view all the answers

What did Robert Hooke specifically observe in plant cells in 1665?

The 'cellular' structure Signup and view all the answers

What is a significant implication of understanding cellular structure and function through microscopy?

It has profoundly impacted medical, biological, and environmental research by unlocking mysteries of cellular processes and their applications in health and disease management. Signup and view all the answers

Which feature of microscopes makes it possible to see beyond the naked eye?

The use of beams of electrons instead of light Signup and view all the answers

What is the primary purpose of using objective lenses of varying magnification in a light microscope?

To increase magnification and obtain detailed observations of specimens Signup and view all the answers

What is the significance of proper handling and maintenance of light microscopes?

To preserve their functionality and precision Signup and view all the answers

What is the main difference between a Transmission Electron Microscope (TEM) and a Scanning Electron Microscope (SEM)?

TEM provides a 2D image of the internal structure of the specimen, while SEM provides a 3D image of the surface features. Signup and view all the answers

What did Antonie van Leeuwenhoek observe using more refined lenses?

He observed bacteria and single-celled organisms. Signup and view all the answers

How does magnification affect the field of view in microscopy?

As magnification increases, the field of view decreases. Signup and view all the answers

Which statement best describes the role of chemical stains in microscopy?

Chemical stains were introduced to enhance the visibility of internal cell structures. Signup and view all the answers

What is the significance of the cell theory positing that 'all cells originate from pre-existing cells'?

This statement supports the principle that cells are the fundamental unit of life and continue to replicate and divide to give rise to new cells. Signup and view all the answers

What is NOT a life function exhibited by cells according to cell theory?

Intelligence Signup and view all the answers

CH 2: Molecular make up of cells

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Questions and Answers

Who discovered plant cells in 1665?

What technique was introduced to enhance the visibility of internal cell structures during the evolution of microscopy?

In which century were cells first observed using simple magnifying devices?

What type of microscopes provided significantly improved clarity and magnification by the early 1900s?

Which scientist advanced the study of microbiology by observing bacteria and single-celled organisms in the 17th century?

What revolutionary advancement in microscopy occurred in 1940?

What type of lenses do microscopes use to magnify objects?

What did Robert Hooke discover in cork in 1665?

What did Antonie van Leeuwenhoek observe using refined lenses?

What is the fundamental principle of cell theory?

Which type of microscope uses beams of electrons instead of light for magnification?

What is crucial for preserving the functionality of light microscopes?

How is magnification calculated in a light microscope?

What is NOT a life function exhibited by cells according to cell theory?

How are field of view and magnification related in microscopy?

Who developed cell theory in 1838?

What is used to deduce the actual size of objects in micrographs?

What are the essential components of a light microscope?

What happens to the field of view as magnification increases?

What is the main difference between a Transmission Electron Microscope (TEM) and a Scanning Electron Microscope (SEM)?

How does magnification affect the field of view in microscopy?

Why is proper handling and maintenance crucial for light microscopes?

What is the significance of the cell theory positing that 'all cells originate from pre-existing cells'?

How do you calculate the size of objects in micrographs using scale bars?

What does cell theory propose about all living organisms?

Why are compound lenses used in microscopes to increase magnification?

How does the field of view change as magnification increases?

What did Antonie van Leeuwenhoek observe using more refined lenses?

What was a significant improvement brought about by the development of electron microscopes?

What was the primary purpose of using chemical stains in microscopy?

How did Robert Hooke contribute to the field of cell biology?

What role do convex lenses play in the operation of microscopes?

What did early microscopes primarily reveal about cells?

Why were chemical stains introduced in the evolution of microscopy?

Which type of microscope allowed detailed visualization of organelles like mitochondria?

What did Robert Hooke specifically discover in plant cells in 1665?

What was a limitation of early microscopes regarding cellular observation?

What was the primary purpose of introducing chemical stains in the evolution of microscopy?

Who made significant advancements in microbiology by observing bacteria and single-celled organisms using refined lenses in the 17th century?

What did early lens microscopes primarily reveal about cells?

What revolutionary step occurred in the field of microscopy in 1940?

How do microscopes magnify objects?

Why are convex lenses essential for the operation of microscopes?

What technological advancement significantly improved the clarity and magnification of cellular structures by the early 1900s?

Which scientist discovered plant cells and noted their 'cellular' structure in cork in 1665?

What did Robert Hooke specifically observe in plant cells in 1665?

What is a significant implication of understanding cellular structure and function through microscopy?

Which feature of microscopes makes it possible to see beyond the naked eye?

What is the primary purpose of using objective lenses of varying magnification in a light microscope?

What is the significance of proper handling and maintenance of light microscopes?

What is the main difference between a Transmission Electron Microscope (TEM) and a Scanning Electron Microscope (SEM)?

What did Antonie van Leeuwenhoek observe using more refined lenses?

How does magnification affect the field of view in microscopy?

Which statement best describes the role of chemical stains in microscopy?

What is the significance of the cell theory positing that 'all cells originate from pre-existing cells'?

What is NOT a life function exhibited by cells according to cell theory?

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