THE CELL
STRUCTURE AND FUNCTION OF THE CELL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Cells are small because it allows a faster rate of chemical exchange.
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Cells are small because it allows a slower rate of chemical exchange.
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Cells are large because it allows a faster rate of chemical exchange.
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Cells are large because it allows a slower rate of chemical exchange.
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Detailed explanation-1: -Cells are large because it allows a faster rate of chemical exchange.
Detailed explanation-2: -It is selectively permeable to ions and organic molecules and controls the movement of substances in and out of cells apart from cell-cell recognition. It has a host of important properties which include, fluidity, compartmentalization, transport, signaling etc. Thus, the correct answer is option D.
Detailed explanation-3: -Hint: Exchange of substances between a cell and its environment takes place through the cell membranes and if it is a plant cell, then the cell wall is also present. The cell wall is freely permeable to all substances which means it does not stop anything from entering and exiting.
Detailed explanation-4: -Final answer: The statement which is true for cells is a single cell can perform all the functions in a unicellular organism.
Detailed explanation-5: -Cells are so little, so they can maximize their ratio of surface area to volume. Smaller cells have a higher ratio which allow more molecules and ions move across the cell membrane per unit of cytoplasmic volume. Cells are so small because they need to be able to get the nutrients in and the waste out quickly.