Which part of the nucleus is responsible for assembling ribosomes and ribosomal RNA?

Most of the proteins that enter the nucleus possess a nuclear localization signal (NLS), even if they are small enough to pass through the nuclear pore complex unhindered. Why would a small protein have an NLS, when it naturally diffuses across the nuclear pore complex without one?

In which cell would you find the most smooth 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

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

Describe the pathway of the protein hormone insulin from its gene to its export from a cell of your pancreas.

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?

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

Which structure is part of the endomembrane system?(A) mitochondrion(B) Golgi apparatus(C) chloroplast(D) centrosome