TrueFalse and why Nuclearencoded chloroplast proteins are im

True/False and why.

--Nuclear-encoded chloroplast proteins are imported into plastids co-translationally

--Chloroplast proteins typically have an N-terminal signal sequence.

--Chloroplasts use the proton gradient across their inner envelope membrane to drive protein import.

-- Thylakoid proteins are transported from the cytosol in two steps.

--Thylakoid proteins are all transported across the thylakoid membrane via the same mechanism.

Solution

answer= 1] nuclear encoded chloroplast proteins are imported into plastids co-translationaly

True = the plastid surrounded by CER suggested that chloroplast precursor proteins are translated on ribosomes attached to CER & cotranslationaly imported across this outermost membrane

it is proof by gibbs hypothesis