Skeletons that form hard mineral matrices usually contain
A) actin.
B) cartilage.
C) calcium.
D) chitin.

Question

Quizplus · Accepted Answer

Hard mineral matrices, such as bones and shells, usually contain calcium. Option A, actin, is a protein that supports muscle function but does not contribute to mineral matrices. Option B, cartilage, is a precursor to bone formation but is not a mineralized structure. Option D, chitin, is a polysaccharide that forms the hard exoskeletons of arthropods but is not found in vertebrate skeletons.

Skeletons That Form Hard Mineral Matrices Usually Contain