Hemoglobin is a _________ that requires the presence of the mineral _________ to function properly.
|A|| Protein; iodine|
|B|| Lipid; iron|
|C|| Protein; iron|
|D|| Protein; chromium|
Ans. C Hemoglobin is a protein that must complex with iron in order to perform its function, which is to carry oxygen in red blood cells. Iodine is complexed with the thyroid hormone thyroxin (choice A); hemoglobin is certainly not a lipid (choice B); and chromium is a mineral that interacts with insulin as part of the glucose tolerance factor.