Question

The “heme” containing protein(s) is/are

• A. cytochrome C
• B. hemocyanin
• C. hemerythrin
• D. myoglobin

Hint:

Heme proteins always contain an iron–porphyrin complex, unlike hemocyanin (Cu) and hemerythrin (non-heme Fe).

Answer 1

The Correct Option is A, D

Step 1: Understanding heme proteins.
Heme proteins contain an iron–porphyrin complex known as the heme group. These proteins use Fe as the central metal for oxygen transport or electron transfer.
Step 2: Analyzing the options.
(A) Cytochrome C – contains heme C group → correct.
(B) Hemocyanin – contains copper, not heme → incorrect.
(C) Hemerythrin – contains iron but no heme group → incorrect.
(D) Myoglobin – contains heme (Fe-porphyrin) → correct.
Step 3: Conclusion.
Thus, the heme-containing proteins are cytochrome C and myoglobin.