What is the name of the iron-based protein that bonds strongly to oxygen and is a major part of red blood cells?

• A. Myoglobin
• B. Hemoglobin
• C. Albumin
• D. Keratin

Answer: (B)

Hemoglobin is the iron-based protein found in red blood cells that plays a crucial role in transporting oxygen throughout the body. Each hemoglobin molecule can bind to four oxygen molecules due to its iron-containing heme groups, allowing efficient oxygen delivery to tissues. This protein's structure enables it to pick up oxygen in the lungs and release it in the body’s tissues, which is vital for cellular respiration and energy production.

In contrast, myoglobin, while also an iron-containing protein, primarily serves as an oxygen reservoir in muscle cells rather than in red blood cells. Albumin is a different type of protein primarily responsible for maintaining osmotic pressure in the blood and transporting substances but does not directly bind oxygen. Keratin is a structural protein found in hair, nails, and skin, unrelated to oxygen transport. Hemoglobin's unique structure and function make it the main protein involved in oxygen transport in the bloodstream.