Which of the following statements is TRUE about major histocompatibility (MHC) proteins?
A. All cells produce both class I and class II MHC proteins.
B. MHC proteins can bind multiple epitopes simultaneously.
C. All cells produce class II MHC proteins.
D. Class I and II MHC proteins are on the cytoplasmic membrane.
E. Class I MHC are secreted while class II is on the cytoplasmic membrane.
Answer: D
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