2. Cell Chemistry & Cell Components

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?

Which of the following is not a function of the smooth endoplasmic reticulum?

Which of the following correctly describes the steps required for protein transport into the rough endoplasmic reticulum (ER)?

Functions of the smooth endoplasmic reticulum include which of the following?

Which of the following is a function of the rough endoplasmic reticulum (ER)?

What is the primary function of the rough endoplasmic reticulum in eukaryotic cells?

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

Molecular zip codes direct molecules to particular destinations in the cell. How are these signals read?a. They bind to receptor proteins.b. They enter transport vesicles.c. They bind to motor proteins.d. They are glycosylated by enzymes.

Cells that line your intestines are known to possess a large number of membrane proteins that transport small molecules and ions across the plasma membrane. Which of the following cell structures would you expect to be required for this characteristic of the cells?a. the endoplasmic reticulumb. peroxisomesc. lysosomesd. the cell wall

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

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

The fusing of Golgi vesicles at the metaphase plate of dividing plant cells forms what structure?

What is the primary function of the smooth endoplasmic reticulum in eukaryotic cells?

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