MSCI 660 INTRACELLULAR MEMBRANE
TRAFFIC AND CELLULAR SORTING 2026
VESICLE TRANSPORT PRACTICE SET
ANSWERS FULL SOLUTION
◉ Translocon.
Answer: Multisubunit protein assembly that transports proteins
across the mitochondrial outer membrane.
◉ Smooth endoplasmic reticulum.
Answer: Region of the ER not associated with ribosomes.
◉ Signal recognition particle.
Answer: Ribonucleoprotein complex that binds an ER signal
sequence on a partially synthesized polypeptide chain and directs
the polypeptide and its attached ribosome to the ER.
◉ Co-translational import.
Answer: Describes import of a protein into the ER before the
polypeptide chain is completely synthesized.
◉ Retention signal.
, Answer: Short amino acid sequence on a protein that keeps it in the
ER.
◉ Glycoprotein.
Answer: Any protein with one or more oligosaccharide chains
covalently linked to amino acid side chains.
◉ Free ribosome.
Answer: Ribosome in the cytosol that is unattached to any
membrane.
◉ Transport vesicle.
Answer: General term for a membrane-enclosed container that
moves material between membrane-enclosed compartments within
the cell.
◉ Rab proteins.
Answer: Any of a large family of monomeric GTPases present in the
plasma membrane and organelle membranes that confer specificity
on vesicle docking.
◉ Clathrin adaptor protein.
TRAFFIC AND CELLULAR SORTING 2026
VESICLE TRANSPORT PRACTICE SET
ANSWERS FULL SOLUTION
◉ Translocon.
Answer: Multisubunit protein assembly that transports proteins
across the mitochondrial outer membrane.
◉ Smooth endoplasmic reticulum.
Answer: Region of the ER not associated with ribosomes.
◉ Signal recognition particle.
Answer: Ribonucleoprotein complex that binds an ER signal
sequence on a partially synthesized polypeptide chain and directs
the polypeptide and its attached ribosome to the ER.
◉ Co-translational import.
Answer: Describes import of a protein into the ER before the
polypeptide chain is completely synthesized.
◉ Retention signal.
, Answer: Short amino acid sequence on a protein that keeps it in the
ER.
◉ Glycoprotein.
Answer: Any protein with one or more oligosaccharide chains
covalently linked to amino acid side chains.
◉ Free ribosome.
Answer: Ribosome in the cytosol that is unattached to any
membrane.
◉ Transport vesicle.
Answer: General term for a membrane-enclosed container that
moves material between membrane-enclosed compartments within
the cell.
◉ Rab proteins.
Answer: Any of a large family of monomeric GTPases present in the
plasma membrane and organelle membranes that confer specificity
on vesicle docking.
◉ Clathrin adaptor protein.
