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 ability to stain protein molecules with a fluorescent dye would most clearly allow researchers to go beyond what they could previously detect with a microscope by allowing them to
◦ detect ribosome activity.
◦ determine whether a cell had cilia or flagella.
◦ distinguish a prokaryote from a eukaryote.
◦ detect when DNA is replicating.
Make a note of the reading on the gauge after the first “puff,” which indicates the first ...
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