<prompt> How do proteins enter peroxisomes?Folded, using a C-terminal or internal signal sequenceFolded, using an N-terminal or internal signal sequenceUnfolded, using a C-terminal or internal signal sequenceUnfolded, using an N-terminal or internal signal sequence  <response>: Peroxisomal proteins are fully folded in the cytoplasm and enter the organelle in folded form. The most common signal sequence which directs proteins to peroxisomes is a C-terminal Ser-Lys-Leu tripeptide. Reference: Harper; 30th edition 