Cell Bio

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  1. The outer membrane of the nucleus is continuous with the membrane of which other organelle?
    Endoplasmic Reticulum (ER)
  2. Which organelle is the major site of new membrane synthesis in a cell?
    Endoplasmic Reticulum (ER)
  3. Which organelle recieves proteins and lipids from the endoplasmic reticulum, modifies them, & then dispatches them to other destinations in the cell?
    Golgi Apparatus
  4. Which organelle is essentially a small sac of digestive enzymes that functions in degrading worn-out organelles, as well as macromolecules and particles taken into the cell by endocytosis?
  5. Which organelle sorts ingested molecules and recycles some of them back to the plasma membrane?
  6. Which organelle contains enzymes used in a variety of oxidative reactions that break down lipids and destroys toxic molecules?
  7. Which of the following organelles is NOT surrounded by a double membrane?
    • a) mitochondria
    • b) chloroplast
    • c) golgi apparatus
    • d) nucleus
  8. How does the interiors of the ER, Golgi, endosomes, and lysosomes communicate w/ each other?
    By small vesicles that bud off one organelle and fuse with another.
  9. Most mitochondrial proteins are made in which compartment of the cell?
  10. Proteins that lack a sorting signal signal remain as permanent residents of which part of the cell?
  11. What happens if a signal sequence is removed from an ER protein?
    the protein remains in the cytosol
  12. Proteins have to unfold during their transport across the membranes of all but one of the following organelles. Which one?
    • a) nucleus
    • b) mitochondria
    • c) chloroplasts
    • d) endoplasmic reticulum
  13. Which proteins bind to nuclear localization signals on newly synthesized proteins?
    nuclear import receptors
Card Set
Cell Bio
Chapter 15
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