Packaging and Secretion

When the protein is processed by the last Golgi cisterna, farthest from the rough ER, that cisterna pinches off membrane-bounded Golgi vesicles containing the finished product. Some Golgi vesicles become secretory vesicles, which migrate to the plasma membrane and release the product by exocytosis. This is how a cell of the salivary gland, for example, secretes mucus and digestive enzymes. The destinations of these and some other newly synthesized proteins are summarized in table 4.3.

Before You Go On

Answer the following questions to test your understanding of the preceding section:

  1. Define genetic code, codon, and genome.
  2. Describe the genetic role of RNA polymerase.
  3. Describe the genetic role of ribosomes and tRNA.
  4. Why are chaperones important in ensuring correct tertiary protein structure?
  5. What roles do the rough ER and Golgi complex play in protein production?

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Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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