Question

The biomolecule that does NOT contain iron is

• A. cytochromes
• B. hemocyanin
• C. hydrogenases
• D. hemerythrin

Hint:

Hemocyanin contains copper instead of iron, unlike cytochromes, hemerythrin, and hydrogenases, which contain metals like iron or nickel.

Answer 1

The Correct Option is B

Step 1: Understanding the biomolecules.
- Cytochromes: These are proteins involved in electron transport in cells and contain iron in their heme group.
- Hemocyanin: A copper-containing protein that carries oxygen in the blood of some arthropods and mollusks, does not contain iron.
- Hydrogenases: These enzymes catalyze the reversible oxidation of hydrogen and do not contain iron but often contain other metal centers like nickel.
- Hemerythrin: This is an iron-containing oxygen transport protein found in some invertebrates.
Step 2: Conclusion.
The biomolecule that does NOT contain iron is hemocyanin. Final Answer: \[ \boxed{\text{Hemocyanin does not contain iron.}} \]