Multiple choice Which among the following is oxygen as well as nitrogen carrier? Hemocyanins Hemoglobin Leghemoglobin Hemolymph Reveal answer Fill a bubble to check yourself C Correct answer Explanation Leghemoglobin is both a nitrogen or oxygen carrier, because naturally occurring oxygen and nitrogen look the same to this protein and a hemoprotein found in the nitrogen-fixing root nodules of leguminous plants.