Multiple Choice
Which of the following is NOT a type of cell membrane junction?
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5. Cell Components
Cell Junctions
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Which of the following is a major cause of the size limits for certain types of cells?
A
The ratio of surface area to volume
B
The number of cell junctions present
C
The amount of genetic material in the nucleus
D
The presence of mitochondria
Verified step by step guidance1
Understand the concept of surface area-to-volume ratio: As a cell grows larger, its volume increases faster than its surface area. This ratio is critical because the surface area determines the ability of the cell to exchange materials (like nutrients and waste) with its environment.
Recognize the importance of efficient exchange: Cells rely on diffusion for the movement of substances. A smaller surface area relative to volume can limit the rate at which essential materials enter and waste products leave the cell.
Consider the implications of cell size: Larger cells may struggle to maintain adequate exchange rates due to the reduced surface area-to-volume ratio, which can limit their functionality and survival.
Evaluate the other options: The number of cell junctions, the amount of genetic material, and the presence of mitochondria do not directly influence the size limits of cells in the same way as the surface area-to-volume ratio does.
Conclude that the major cause of size limits for certain types of cells is the surface area-to-volume ratio, as it directly impacts the cell's ability to sustain itself through efficient material exchange.
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