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The presence of a transit sequence directs a protein from the ________ to the ________.

A) cytosol; mitochondrion or chloroplast
B) endoplasmic reticulum; Golgi apparatus
C) cytosol; plasma membrane
D) endoplasmic reticulum; nucleus
E) signal recognition particle; nucleus

1 Answer

4 votes

Final answer:

The presence of a transit sequence in a protein leads it from the cytosol to the mitochondrion or chloroplast, involving specific signal peptides that direct the proteins after post-translational modification.

Step-by-step explanation:

The presence of a transit sequence directs a protein from the cytosol to the mitochondrion or chloroplast. This is a process where proteins synthesized in the cytosol, which are destined for these organelles, contain specific oligopeptide traffic signals. These traffic signals direct proteins to their appropriate destinations after post-translational modification. Mitochondrial protein transfer, for example, involves a folded protein exposing an N-terminal signal peptide that binds to a receptor protein at the outer mitochondrial membrane, facilitating its import into the organelle.

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