Why are slow-twitch muscles dark?

A. They are designed for strength and explosions of energy.
B. They have fewer mitochondria.
C. They have many more myofibrils per motor unit than fast-twitch fibers.
D. They contain myoglobin.
E. They need less blood than fast-twitch fibers.


Answer: D

Biology & Microbiology

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A technique used in dating a rock can be used to accurately predict the age of the fossils occurring in the rocks. This technique involves

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Luminol interferes with DNA testing and, therefore, should not be applied directly to a bloodstain.

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