Question: Insulin is an important protein for the regulation of glucose levels in the blood. Which statement best describes the function of insulin?

  Options: 
 A. Insulin stimulates cells to absorb glucose from the blood.
 B. Insulin causes the liver to release glucose into the blood.
 C. Insulin facilitates the effects of antibiotics in the cell.
 D. Insulin develops chemical bonds on the cell membrane. 
Answer: A