CELL STRUCTURES AND FUNCTION
CELL ORGANELLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Early Romans discovered that objects could be magnified through the construction and shaping of glass. For the past thousand years, this discovery has led to the construction and design of modern day microscopes. The development of the microscope was used in the 17th and 18th centuries to observe cells and eventually develop “cell theory". Which of the following is the most basic explanation of “cell theory”?
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every object in the universe is made of cells
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cells are made from atoms during chemical reactions
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all living things are made of cells
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all cells are identical
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Explanation:
Detailed explanation-1: -Cell walls are absent in many eukaryotes, including animals, but are present in some other ones like fungi, algae and plants, and in most prokaryotes (except mollicute bacteria). A major function is to act as pressure vessels, preventing over-expansion of the cell when water enters.
Detailed explanation-2: -How have internal xylem vessels (tubelike structures in a plant’s stem) allowed plants to adapt to living on land? They allow land pants to sense herbivores so they can release toxins through the vessels. They allow land plants to transport water far above the ground to other plant structures.
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