Indicate True (T) and False (F) Statements Below Regarding the Mitochondrial

Short Answer

Indicate true (T) and false (F) statements below regarding the mitochondrial protein import system. Your answer would be a four-letter string composed of letters T and F only, e.g. TTTF.
( ) Mitochondrial proteins should fold natively twice: once in the cytosol and once inside the organelle.
( ) ?-barrel proteins that are abundant in the mitochondrial outer membrane are imported from the cytosol independently of the TOM complex.
( ) Signal sequences that target precursor proteins to the mitochondrial matrix form an ?- helix in which positively charged residues cluster near its N-terminus, while uncharged or hydrophobic residues cluster near the other side.
( ) At least two signal sequences are required to direct proteins to the mitochondrial matrix.