Protein Synthesis
The pathway of a tRNA during polypeptide elongation on the ribosome is

A site → P site → entry site
A site → P site → E site
P site → A site → E site
P site → entry site → exit site

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Protein Synthesis
Type I proteins (plasma membrane) have a

multiple signal sequence that doubles as the membrane anchoring sequence
cleavaged N- terminal signal sequence that doubles as the membrane anchoring sequence
cleavage N- terminal signal sequence and a hydrophobic stop transfer sequence
multiple signal sequence and a hydrophobic stop transfer sequence

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