Many biologists speculate that the first major steps in the evolution of a eukaryotic cell from a prokaryotic ancestor would be the loss of a cell wall and the development of an extensive cytoskeleton. Why do you suppose these steps are so important?
The eukaryotes or eukaryotic beings are those that contain well-differentiated nuclear arrangements, including well-defined nucleolus and nuclear membrane. Generally, these organisms have cell constituents that are bound by a membrane.
Answer and Explanation: 1
One can speculate that during the course of evolution of the eukaryotes from the prokaryotic ancestors, they lost cell wall. The loss of the cell wall was significant as the cell wall is a robust structure that would hinder the evolution towards multicellularity. Therefore, it was important for the eukaryotes to lose cell wall during evolution and proceed to form multicellular organisms. The cytoskeleton was absent or underdeveloped in the prokaryotic ancestors as these cell organelles provide cellular support and transport cell organelles which is not necessary for the prokaryotes. During evolution, eukaryotes developed extensive cytoskeleton to support the cells and make up for the loss of cell walls. Also, the cytoskeleton would have been designed to assist the transfer of cell organelles within the cells. Hence, the development of an extensive cytoskeleton and loss of cell wall was necessary.
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fromChapter 7 / Lesson 42
Explore eukaryotic cell organelles. Discover whether eukaryotic cells have a nucleus and understand its importance. See the organelles of the eukaryotic cell.