Blood is red because of the presence of which molecule?Multiple choice question.PlasminAntibodiesHemoglobinThrombin

Break Down the Problem

1. Identify the options given: Plasmin, Antibodies, Hemoglobin, Thrombin.
2. Determine the role of each molecule in the blood.

Relevant Concepts

1. Hemoglobin: A protein found in red blood cells that is responsible for transporting oxygen. It contains iron, which gives blood its red color.
2. Plasmin: An enzyme involved in the breakdown of fibrin in blood clots, not related to blood color.
3. Antibodies: Proteins produced by the immune system to identify and neutralize pathogens, not related to blood color.
4. Thrombin: An enzyme that plays a role in blood clotting, not related to blood color.

Analysis and Detail

• Blood appears red primarily due to hemoglobin. When oxygen binds to hemoglobin, it reflects light in a way that appears red to the human eye.
• Other molecules listed do not play a significant role in determining the color of blood.

Verify and Summarize

• Since hemoglobin is the key molecule responsible for the red color of blood due to its iron content and oxygen-binding properties, this option is the correct choice.

Final Answer

Hemoglobin