Which of the Following Is a Difference Between Class I

Multiple Choice

Which of the following is a difference between class I and class II major histocompatibility complex (MHC) proteins?

A) Class I MHC proteins can be found on most cell types, whereas both class I and II MHC proteins are found on the antigen-presenting cells of the immune system
B) Class I MHC proteins are added to antigens in the cytoplasm, whereas class II proteins are added to antigens in the Golgi apparatus.
C) Class I MHC proteins signal the immune system to activate the cell displaying the message, whereas class II proteins signal the immune system to destroy a particular cell.
D) Class I and class II MHC proteins have the same basic role, but individuals with particularly strong immune systems will have both types, whereas most individuals have just one or the other.