QCM : Introduction to Cell Biology and Microscopy — 7 questions

Questions et réponses du QCM

1. What was the effect of Redi's experiment on the theory of spontaneous generation?

It demonstrated that maggots come from fly eggs, thus disproving spontaneous generation.
It proved that flies do not lay eggs on meat.
It showed that non-living matter can produce living organisms.
It confirmed that maggots could arise spontaneously from meat.

It demonstrated that maggots come from fly eggs, thus disproving spontaneous generation.

Explication

Redi's experiment demonstrated that maggots did not arise spontaneously from meat but came from fly eggs, disproving the idea of spontaneous generation.

2. In the chronological development of cell theory components, when was Schleiden and Schwann's conclusion that all organisms are made of cells established relative to Hooke's discovery of cells?

At the same time as Hooke's discovery of cells
After Hooke's discovery of cells
Before Hooke's discovery of cells
The source does not specify the exact chronological order

After Hooke's discovery of cells

Explication

Schleiden and Schwann concluded that all organisms are made up of cells, which was a significant milestone in cell theory. While the source does not specify exact dates, historically, Hooke's discovery of cells predates Schleiden and Schwann's conclusion, establishing that Schleiden and Schwann's conclusion came after Hooke's initial observation.

3. How can Pasteur's discovery about microorganisms emerging from existing life be applied in modern microbiology practices?

To design sterilization techniques that eliminate all microorganisms
To create vaccines that prevent virus infections
To develop antibiotics that target only bacteria
To improve the resolution of microscopes for viewing tiny cells

To design sterilization techniques that eliminate all microorganisms

Explication

Pasteur's discovery that microorganisms come from other microorganisms underpins sterilization techniques used to eliminate microbes, which is essential in medical and food safety practices. This knowledge guides effective sterilization methods, unlike the other options which relate to different aspects of microbiology or microscopy.

4. What is the primary function of the microscope's body tube?

It holds the objective lenses in place.
It holds the ocular lens in place, ensuring proper alignment for viewing.
It secures the slide on the stage.
It adjusts the amount of light reaching the specimen.

It holds the ocular lens in place, ensuring proper alignment for viewing.

Explication

The body tube's primary function is to hold the ocular lens in place and ensure proper alignment for clear viewing, as stated in the source: 'The body tube holds the ocular lens in place, ensuring proper alignment for viewing.' The other options describe functions of other parts: objective lenses are attached to the nosepiece, the diaphragm controls light, and stage clips secure slides.

5. How do the total magnifications of low, medium, and high power compare in terms of their numerical values?

Low power is 40X, medium power is 100X, high power is 400X
Low power is 10X, medium power is 20X, high power is 80X
Low power is 400X, medium power is 100X, high power is 40X
Low power is 4X, medium power is 10X, high power is 40X

Low power is 40X, medium power is 100X, high power is 400X

Explication

The source specifies that low power magnification equals 40X, medium power equals 100X, and high power equals 400X, making the first option correct. The other options do not match these specified magnifications.

6. What is the main purpose of cell staining in microscopy?

To improve the visibility of cells and highlight specific structures
To increase the size of the cells for easier viewing
To preserve the cells for long-term storage
To kill the cells before observation

To improve the visibility of cells and highlight specific structures

Explication

Cell staining is used to make cells easier to see under a microscope and to highlight specific structures or substances within the cell, thereby enhancing visualization and allowing detailed study of cellular components.

7. Which scientist is credited with coining the term 'cells' after examining cork under a microscope?

Robert Hooke
Matthias Schleiden
Anton Van Leeuwenhoek
Louis Pasteur

Robert Hooke

Explication

Robert Hooke is credited with coining the term 'cells' after his microscopic examination of cork, which marked a foundational moment in cell biology.

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Spontaneous generation — definition?

Life arising from non-living matter.

Redi's experiment — purpose?

Disproved spontaneous generation of maggots.

Cell theory components — three?

All living things made of cells, cells smallest unit, cells come from other cells.

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