Heme is composed of iron and:
a. Globin chains
b. Oxygen
c. Methemoglobin
d. Protoporphyrin IX
ANS: D
Iron is incorporated into protoporphyrin IX in the mitochondria of a developing red blood cell (RBC) to form heme. Oxygen binds reversibly to the iron in heme provided that iron is in the ferrous (divalent, reduced) state. Globin chains are part of the hemoglobin molecule; four of them exist per molecule, each containing a heme group. Methemoglobin is hemoglobin in which the iron is oxidized to the ferric (trivalent) form; it cannot bind oxygen.
You might also like to view...
Which type of fracture is characterized as partial and may result from activities such as jumping or jogging?
a. avulsion b. comminuted c. greenstick d. oblique
Which of the following statements is true about the BCBS (Blue Cross Blue Shield) Association
A. It is the single largest trade association of private health care insurers in the United States. B. It covers hospital and related services only. C. It covers physician services only. D. It is a for-profit organization.
The HIPAA Security Rule and the HIPAA Privacy Rule are enforced by the
A. Centers for Medicare & Medicaid Services (CMS). B. Federal Bureau of Investigation (FBI). C. Occupational Safety and Health Administration (OSHA). D. Office of Civil Rights (OCR).
Which of the following source claims are created in Medisoft?
A. from paper claims filed in the office B. from transactions previously entered in medisoft C. from insurance carrier information in medisoft D. None of these are correct.