Question

Which of the following best describes what happens after a protein is made in the endoplasmic reticulum of an animal cell?

Answer 1

It is sent to the Golgi apparatus for further processing.

It attaches to a ribosome to be encoded and used in DNA replication.

It is stored in the large central vacuole until it is needed by the cell.

It is released to the mitochondria to be broken down and used for energy

Answer 2

The ribosome produces the protein by assembling amino acids as directed by messenger RNA; therefore, the ribosome comes before the step that is being asked about, so it's not the ribosome.
The mitochondria consume glucose and oxygen. They do not break proteins down, so it's not the mitochondria.
If you go to the Wikipedia article http://en.wikipedia.org/wiki/Cisternae you will see which of the remaining two choices is most likely to be the best answer.