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Peptides loaded onto MHC class I are:

A. Generated in the cytoplasm
B. Produced by the proteasome
C. From endogenous proteins
D. Transported to the endoplasmic reticulum
E. All of the above

Answer :

Final answer:

Peptides presented by MHC class I are generated in the cytoplasm, produced by the proteasome, derived from endogenous proteins, and transported to the endoplasmic reticulum, hence the correct answer is 'E. All of the above'.

Explanation:

Peptides loaded onto MHC class I molecules are: A. Generated in the cytoplasm, B. Produced by the proteasome, C. From endogenous proteins, D. Transported to the endoplasmic reticulum, and E. All of the above. MHC class I molecules are essential for presenting intracellular antigens, particularly from viruses and other pathogens that replicate inside cells. These antigens are processed by proteasomes in the cytoplasm, transported into the endoplasmic reticulum by the transporter associated with antigen processing (TAP), where they are then loaded onto MHC class I molecules for presentation to T cells.

The endomembrane system is involved in the processing and presentation of antigens on the cell surface for immune recognition. While MHC class II molecules present extracellular antigens, MHC class I molecules specialize in presenting intracellular or endogenous antigens.

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