Cell Structure and Function Question 7

The figure above shows a series of microscope images taken over time of ovalbumin production in chick oviduct cells in response to stimulation with estrogen. The ovalbumin protein was detected using a fluorescent dye as shown by the white areas in the time-lapse sequence.

The microscope images indicate that ovalbumin

is synthesized on soluble ribosomes and packaged into lysosomes, from which it is secreted into the oviduct

is synthesized on ribosomes bound to the rough endoplasmic reticulum, and then secreted directly into the oviduct

crosses the endoplasmic reticulum membrane as it is translated, then moves to the Golgi apparatus, then to vesicles from which it is secreted

crosses the Golgi apparatus membrane post-translationally, is taken up by the Golgi apparatus and endoplasmic reticulum, then is packaged into secretory vesicles