Question

please read every question carefully and select the best answers. youll have 55 minutes for the exam. question 20 1 pts what is the best description for hemoglobin? a pigment in chloroplasts responsible for photosynthesis an iron - containing molecule that can bind up to four oxygen molecules an enzyme that speeds up chemical reactions a molecule in the lungs that helps gases diffuse

Explanation:

Hemoglobin is an iron - containing protein in red blood cells that binds and transports oxygen. It can bind up to four oxygen molecules. The first option describes chlorophyll, the third option describes an enzyme's function, and the fourth option is not an accurate description of hemoglobin.

Answer:

an iron - containing molecule that can bind up to four oxygen molecules