After reading the paragraph below, answer the questions that follow.
Studies of the endomembrane system often involve the use of a protein that can emit a green fluorescence (glow). A researcher wants to make a video of cell behavior, so she initially labels the outer nuclear envelope of a cell with the fluorescent tag and records a video for several hours. Later, she sees that the tag is part of a transport vesicle very close to the plasma membrane.
The fluorescent tag likely became incorporated into which of the following organelles during the video?
◦ endoplasmic reticulum
◦ mitochondria
◦ peroxisomes
◦ ribosomes