Answer :
Final answer:
MHC Class I molecules are present on most host cells except red blood cells and play a vital role in immune responses.
Explanation:
MHC Class I molecules are found on all host cells except for red blood cells. They play a crucial role in presenting normal and abnormal antigens to Cytotoxic T cells for immune responses.
Learn more about Major Histocompatibility Complex (MHC) molecules here:
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