Each of the following statements concerning mitochondria is true, EXCEPT a.The mitochondria require carbon dioxide and produce oxygen in the process of energy production.   b.The matrix contains metabolic enzymes involved in energy production.   c.The cristae increase the inner surface area of the organelle.   d.Respiratory enzymes are attached to the surface of the cristae   One of the following is TRUE about fibroblasts a.Are responsible for storage of fat b.Lines blood vessels and capillaries c.Secrete collagenous and elastic fibers d.Cubical large cells

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