Question

lo 2.1. what is the protein found in red blood cells that binds to oxygen molecules?
hemoglobin.
keratin.
globulin.
fibrinogen.
myoglobin.

Explanation:

Hemoglobin is a protein in red blood cells. Its main function is to bind with oxygen molecules in the lungs. Then, it transports the oxygen to different tissues and cells in the body. Keratin is a protein found in hair, nails, and skin. Globulin has various roles like in immunity (e.g., antibodies are globulins). Fibrinogen is involved in blood - clotting. Myoglobin is found in muscle cells and stores oxygen for muscle use.

Answer:

Hemoglobin.