You have just witnessed the process of cell division! What conclusion can you draw from your observation?
a) Cells are created spontaneously
b) Eukaryotic cell arise from prokaryotic cells
c) All cells arise from preexisting cells
d) When new cells grow the old ones die
The Correct Answer and Explanation is :
The correct answer is c) All cells arise from preexisting cells.
Explanation:
Cell division is a fundamental process by which new cells are created. There are two primary forms of cell division: mitosis and meiosis, both of which follow a principle known as cellular continuity. This principle states that all cells originate from preexisting cells, meaning that new cells are created through the division of existing cells.
The concept that “all cells arise from preexisting cells” was first proposed by Rudolf Virchow, a German physician, in 1855, encapsulated in the Latin phrase Omnis cellula e cellula. This concept overturned previous theories that suggested spontaneous generation, the idea that life could arise spontaneously from non-living matter. Today, this idea is widely accepted as a cornerstone of modern biology.
In mitosis, a eukaryotic cell divides into two identical daughter cells, each containing a full set of chromosomes. This type of division allows organisms to grow, repair damaged tissues, and reproduce asexually. In meiosis, which occurs in reproductive cells (gametes), the resulting cells have half the number of chromosomes, ensuring genetic diversity during sexual reproduction.
While both processes involve the division of one cell into multiple cells, they reinforce the idea that cellular life is a continuous process, and no new cell can appear without a parent cell from which it arises. The process of division ensures the maintenance of the organism, and all living organisms are built on this fundamental concept.
The other options are incorrect:
- a) Cells do not appear spontaneously. They are produced through division.
- b) Eukaryotic cells did not evolve directly from prokaryotic cells, although eukaryotic cells are believed to have evolved from prokaryotes through a process known as endosymbiosis.
- d) While some old cells die in certain circumstances (such as apoptosis), it’s not a general rule that all old cells die when new cells grow. Cells can live for varying periods depending on their type and function.