BLOOD TYPE TEST

At 1:00 am., someone breaks a window in the back of a store and robs the safe. On the way out, the thief is cut on a piece of broken glass. A forensic team collects and tests a sample of blood left behind by the thief. It is O-. The police bring in a suspect with a cut forearm who was arrested just three blocks from the store. The person resembles someone seen leaving the store at the time of the robbery. A sample of the suspect's blood is taken and tested for blood type. Once the suspect's blood is mixed with anti-A serum, it is immediately clear that the suspect is not the person who was cut on the broken glass in the store. How did the test indicate that fact?

Suppose the same suspect's blood does not agglutinate when tested with anti-A or anti-B, but does agglutinate when tested with anti-Rh. Would this connect the suspect with the crime scene? Explain your answer.

Tom and Jane participate in a Red Cross blood drive. Both are first-time donors. As part of the screening, their blood is typed. ToM is A+. Jane is AB+. What ABO antibody is found in Tom's blood?

Tom and Jane participate in a Red Cross blood drive. Both are first-time donors. As part of the screening, their blood is typed. ToM is A+. Jane is AB+. What ABO antigens are found in Jane's blood?

Tags

NGSS.HS-LS3-2

The same Tom and Jane's blood donations are sent to a processing center where the blood cells are separated from the plasma in each of the two samples. The separated cells and plasma are then sent to a hospital. A blood researcher wishes to use Tom's blood in an attempt to extract and identify the A antigen. Should she attempt the extraction process on his blood cells or in his plasma?

• The blood cells. The antigens are part of the cell membranes of the blood cells.

• The plasma. The antigens are floating around the blood cells in the plasma.

• The blood cells. The antigens are dissolved in the cytoplasm of the blood cells.

• The plasma. The antigens are attached to the cytoplasm.