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BIO NMDCAT Human skeleton
nmdcat.online July 27, 2026

During an experiment, hydrochloric acid is added to a bone specimen. The remaining structure is soft but retains its shape. This observation indicates that the remaining material mainly consists of:

A. Calcium phosphate
B. Calcium carbonate
C. Collagen fibers
✓
D. Bone marrow

📝 Explanation

Correct: Acid dissolves mineral salts, leaving collagen fibers that provide flexibility. A & B: These mineral salts are removed by acid. D: Bone marrow does not maintain bone shape. Concept: Organic and inorganic components of bone.

📖 Additional Information

  • Calcium phosphate
  • Calcium carbonate
  • Collagen fibers
  • Bone marrow

Correct: Acid dissolves mineral salts, leaving collagen fibers that provide flexibility. A & B: These mineral salts are removed by acid. D: Bone marrow does not maintain bone shape. Concept: Organic and inorganic components of bone.

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