When mucus is secreted from a goblet cell in the trachea, these events take place.
1 addition of carbohydrate to protein
2 fusion of the vesicle with the plasma membrane
3 secretion of a glycoprotein
4 separation of a vesicle from the Golgi apparatus
What is the sequence in which these events take place?
$1 \to 4 \to 2 \to 3$
2 )
$1 \to 4 \to 3 \to 2$
3 )
$4 \to 1 \to 2 \to 3$
4 )
$4 \to 1 \to 3 \to 2$
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