Question

signal sequences that direct proteins to the correct compartment are group of answer choices are always a permanent component of the protein added to a protein by a protein translocator. encoded in the amino acid sequence and are sufficient for targeting a protein to its correct destination added to proteins through post-translational modification.

Answer 1

Signal sequences that direct proteins to the correct compartment are encoded in the amino acid sequence and sufficient for targeting a protein to its correct destination.

A group of hydrophobic ("water-fearing") amino acids are the signal peptide that directs a protein towards the endoplasmic reticulum during translation. These amino acids are often located around the protein's N-terminus. The signal-recognition particle (SRP), a protein complex, detects this sequence when it protrudes from the ribosome and transports the ribosome to the ER. As it is being created there, the ribosome feeds its amino acid chain into the ER lumen (interior).

When the signal peptide is removed during translation, the final protein is sometimes released into the ER's interior (as shown above). In other instances, the ER membrane becomes encased with the signal peptide or another group of hydrophobic amino acids. As a result, a transmembrane segment is formed, which attaches the protein to the membrane.

Hence, signal peptide are decides the target of the protein site.

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