Chapter 6.4 Flashcards
Which organelles are part of the endomembrane system?
- nuclear envelope
- endoplasmic reticulum
- golgi apparatus
- lysosome
- vesicles and vacuoles
- plasma membrane
Give the functions of the endomembrane system.
- synthesis of proteins
- transport of proteins into membranes and organelles or out of the cell
- metabolism and movement of lipids
- detoxification of poisons
Which organelle accounts for more than half of the total membrane in eukaryotic cells?
endoplasmic reticulum
It refers to the network of membranous tubules and sacs of the endoplasmic reticulum.
cisternae
It refers to the internal compartment of the endoplasmic reticulum.
ER lumen or cisternal space
TRUE or FALSE:
The space between the two membranes of the nuclear envelope is continuous with the lumen of the endoplasmic reticulum.
True
Give the functions of the smooth endoplasmic reticulum.
- synthesis of lipids
- metabolism of carbohydrates
- detoxification of drugs and poisons
- storage of calcium ions
TRUE or FALSE:
Detoxification involves addition of hydroxyl groups to drug molecules.
True
It refers to the region of the rough endoplasmic reticulum where transport vessicles bud off.
transitional ER
Which secretory proteins are covalently bonded to carbohydrates?
glycoproteins
Which proteins allow the passage of polypeptide chains (synthesized in the ribosomes of the ER membrane) into the ER lumen?
pore complex
Where do glycoproteins get assembled?
The glycoproteins are assembled in the ER lumen by enzymes built into the ER membrane.
TRUE or FALSE:
Secretory proteins are transported through vesicles.
True
TRUE or FALSE:
The ER membrane grows in place by adding membrane proteins and phospholipids to its own membrane.
True
TRUE or FALSE:
The rough ER synthesizes membrane phospholipids; enzymes of the ER membrane assemble phospholipids from precursors in the cytosol.
True
