easy · Act science
A sample of muscle tissue is analyzed for mitochondrial density. Cells from 'Type I' (slow-twitch) fibers show a density of 1,200 mitochondria per cell, while 'Type II' (fast-twitch) fibers show 450 per cell.
Based on the function of mitochondria, which conclusion is best supported?
- Type I fibers are capable of sustaining aerobic activity for longer periods of time.
- Type II fibers rely exclusively on photosynthesis for their primary energy needs.
- Type I fibers lack the ribosomes necessary to synthesize essential contractile proteins.
- Type II fibers produce significantly more carbon dioxide as a metabolic byproduct.
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