Which of the following is present in muscle cells but absent in most other cell types?

• A. Muscle cells use ATP to do work; most other cells do not.
• B. Muscle cells have a nucleus; most other cells do not.
• C. Muscle cells have myoglobin; most other cells do not.
• D. Muscle cells have mitochondria; most other cells do not.

Answer: (C)

Verified step by step guidance

1. Identify the unique feature of muscle cells that distinguishes them from most other cell types.
2. Consider the role of myoglobin, a protein that binds oxygen, which is particularly important in muscle cells for oxygen storage and release during muscle contraction.
3. Understand that while ATP is used by all cells for energy, myoglobin is specifically abundant in muscle cells to meet their high oxygen demand.
4. Recognize that both muscle cells and other cell types have nuclei and mitochondria, so these are not distinguishing features.
5. Conclude that myoglobin is the correct answer as it is present in muscle cells but absent in most other cell types.