Question

Which one of the following is a non-heme protein?

• A. hemoglobin
• B. hemocyanin
• C. myoglobin
• D. cytochrome P-450

Hint:

Non-heme proteins often contain metals like copper or zinc instead of iron.

Answer 1

The Correct Option is B

Step 1: Understand the Term "Non-Heme Protein."
Non-heme proteins are proteins that do not contain heme groups (iron-containing prosthetic groups). They often contain metal ions like copper or zinc instead of iron in their active sites.

Step 2: Analyze the Options.
- (A) Hemoglobin: Hemoglobin contains heme groups and is a heme protein. - (B) Hemocyanin: Hemocyanin is a non-heme protein that contains copper ions instead of iron in its active site. - (C) Myoglobin: Like hemoglobin, myoglobin contains a heme group and is a heme protein. - (D) Cytochrome P-450: Cytochrome P-450 contains heme groups and is a heme protein.

Step 3: Conclusion.
Hemocyanin is a non-heme protein, so the correct answer is (B).

Final Answer: \[ \boxed{\text{Hemocyanin}} \]