QCM : Fundamentals of Cell Structure and Function — 7 questions

Questions et réponses du QCM

1. How does the role of a cell as a structural unit differ from its role as a functional unit?

The structural role involves energy production, while the functional role involves reproduction.
The structural role is only in plant cells, whereas the functional role is only in animal cells.
The structural role is passive, whereas the functional role is purely structural.
The structural role provides physical support, while the functional role enables life processes.

The structural role provides physical support, while the functional role enables life processes.

Explication

The source states that a cell provides the physical framework (structure) and performs vital activities (functions). The correct answer reflects that the structural role offers support, while the functional role enables life processes, highlighting the dual roles of the cell.

2. Which scientist is credited with discovering dead cells in a cork slice in 1665?

Brown
Schleiden and Schwann
Leeuwenhoek
Robert Hooke

Robert Hooke

Explication

Robert Hooke is credited with discovering dead cells in a cork slice in 1665, which was the first identification of cells. This specific fact is directly stated in the source content and is a key milestone in cell discovery history.

3. What is the primary role of the cell wall in plant cells?

It provides structural support and prevents bursting in hypotonic environments.
It acts as a semi-permeable membrane regulating substance exchange.
It synthesizes proteins necessary for cell functions.
It stores genetic information in the form of DNA.

It provides structural support and prevents bursting in hypotonic environments.

Explication

The source states that the cell wall 'provides structural strength to plant cells and prevents them from bursting when exposed to hypotonic media,' which directly matches option 2. The other options describe functions of different cell components: the plasma membrane regulates exchange, the nucleus stores DNA, and the ribosomes synthesize proteins. Therefore, the correct answer is that the cell wall provides structural support and prevents bursting in hypotonic environments.

4. What is a key feature of the plasma membrane that enables it to regulate the internal environment of the cell?

Its selective permeability to different substances
Its ability to self-repair quickly
Its rigid structural support
Its capacity to produce energy

Its selective permeability to different substances

Explication

The plasma membrane's key feature is its selective permeability, allowing it to control which substances enter and exit the cell, thereby maintaining homeostasis. This property is essential for proper cell function and is explicitly mentioned in the source as a defining characteristic.

5. When did the development of the electron microscope occur, allowing scientists to study cell organelles in greater detail?

In the late 19th century, around 1895
In the early 20th century, around 1940
In the mid 20th century, around 1960
In the early 20th century, around 1920

In the early 20th century, around 1940

Explication

The development of the electron microscope, which enabled detailed study of cell organelles, occurred in 1940, marking a significant advancement in cell biology.

6. Who is credited with proposing the concept of the cell wall's role in providing structural strength and preventing bursting in plant cells?

Louis Pasteur
Robert Hooke
Matthias Schleiden and Theodor Schwann
Alexander Fleming

Matthias Schleiden and Theodor Schwann

Explication

Schleiden and Schwann are credited with developing the cell theory, which includes the understanding that plant cells have a cell wall that provides structural strength and prevents bursting in hypotonic environments. The other scientists made significant contributions to biology but are not specifically credited with proposing this concept of the cell wall.

7. How does the structural difference between prokaryotic and eukaryotic cells influence their suitability for use in cellular research and biotechnology?

Eukaryotic cells are preferred for studying complex cellular processes because of their membrane-bound organelles.
Eukaryotic cells are less suitable for laboratory cultivation because they lack a nucleus.
Prokaryotic cells are more suitable for genetic engineering due to their simple structure.
Prokaryotic cells are used in research requiring complex organelle functions.

Eukaryotic cells are preferred for studying complex cellular processes because of their membrane-bound organelles.

Explication

Eukaryotic cells have membrane-bound organelles, making them suitable for studying complex cellular processes, which is advantageous in research and biotechnology. Prokaryotic cells, lacking such organelles, are simpler but less capable of supporting complex functions, making them less ideal for studying certain cellular mechanisms.

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Cell — basic unit of life?

Smallest structural and functional unit.

Cell discovery — first scientist?

Robert Hooke in 1665.

Nucleus — role?

Controls cell activities and stores DNA.

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