2. Cell Chemistry & Cell Components

Which structure is not part of the endomembrane system?a. nuclear envelopeb. chloroplastc. Golgi apparatusd. plasma membrane

What is the main difference between rough endoplasmic reticulum (ER) and smooth endoplasmic reticulum (ER)?

What is the primary difference between the rough endoplasmic reticulum (ER) and the smooth endoplasmic reticulum (ER) in eukaryotic cells?

The membranes of the endoplasmic reticulum form which of the following structures involved in protein secretion?

In which cell would you find the most rough ER?a. pancreatic cell that secretes digestive enzymesb. ovarian cell that produces estrogen (a steroid hormone)c. muscle cell in the thigh of a long-distance runnerd. white blood cell that engulfs bacteria

A protein that ultimately functions in the plasma membrane of a cell is most likely to have been synthesized __________.

Which of the following results provided evidence of a discrete nuclear localization signal somewhere on the nucleoplasmin protein?a. The nucleoplasmin protein was small and easily slipped through the nuclear pore complex.b. After cleavage of the nucleoplasmin protein, only the tail segments appeared in the nucleus.c. Removing the tail from the nucleoplasmin protein allowed the core segment to enter the nucleus.d. The SRP bound only to the tail of the nucleoplasmin protein, not the core segment.

A researcher made an interesting observation about a protein made by the rough endoplasmic reticulum and eventually found in a cell's plasma membrane. The protein in the plasma membrane was actually slightly different from the protein made in the ER. The protein was probably altered in the __________.

Consider a protein that is made in the rough endoplasmic reticulum. You observe that when the synthesis of the protein is completed, the protein is located in the ER membrane. Where else in the cell might this protein be found?