Blood and blood group

Blood is often collected at a crime scence for DNA testing. Which of the following is true?

• Red blood cells are used for DNA analysis

• Plasma is used for DNA analysis

• White blood cells are used for DNA analysis

• Platelets are used for DNA analysis

What is/are the function(s) of lymphocytes?

• Produce antigens to fight bacteria

• Produce antibodies to fight bacteria

• Engulf bacteria and kill them

• Cause agglutination of bacteria

What is/are the function(s) of phagocytes?

• Produce antigens to fight bacteria

• Produce antibodies to fight bacteria

• Engulf bacteria to kill them

• Recognise foreign particles

What is/are some characteristic(s) of antibodies?

• Proteins that are produced by lymphocytes

• Proteins that are complementary to specific antigens

• Proteins found on the cell membrane of RBCs

• Proteins found in the plasma

Platelets convert fibrinogen to fibrin threads which entangle RBCs to form a blood clot.

• True

• False

Fibrin is insoluble.

• True

• False

Which of the following is/are true about a person with blood type A?

• He has antigen a on the RBCs

• He has antigen A on the RBCs

• He has antibody a in his plasma

• He has antibody b in his plasma

Which of the following is/are true about a person with blood type AB?

• He has antibodies a and b in the plasma

• He has no antibodies in the plasma

• He has antigen B on his RBC

• He has antigen A on his RBC

Which of the following is/are true about a person with blood type O?

• He has no antibodies in his plasma

• He has antibodies a and b in his plasma

• He has antigen O on his RBC

• He has no antigens on his RBC

Who is the universal donor?

• Blood type A

• Blood type B

• Blood type AB

• Blood type O