The endoplasmic reticulum has a quality control system to remove misfolded proteins by tagging them with what small protein?
a. proteasome
b. A-protease
c. ubiquitin
d. B-protease
e. co-enzyme Q-10
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Question 2) Which characteristic of the Golgi complex is incorrect?
a. It sorts and directs products to their final destination.
b. It is a membranous organelle surrounded by cytosol.
c. It produces lysosomes.
d. It modifies proteins made at the rough ER.
e. It receives secretory vesicles coming from the ER.
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Question 3) What type of endoplasmic reticulum (ER) is made of tubules and lumens?
a. long ER
b. smooth ER
c. rough ER
d. Golgi complex
e. short ER
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Question 4) Which structure is not associated with the secretion of proteins produced by ER?
a. Golgi complex
b. smooth ER
c. transport vesicles
d. lysosomal membrane
e. plasma membrane
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Question 5) Rough endoplasmic reticulum (ER) is most abundant in what kind of cells?
a. cells specialized for protein secretion
b. nerve cells
c. cells that require minimal membrane synthesis
d. cardiac muscle cells
e. slowly growing cells
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Question 6) Select the incorrect statement about the smooth ER.
a. It is abundant in most cell types.
b. It is found in liver cells.
c. It specializes in lipid metabolism.
d. In one type of cell, it is called sarcoplasmic reticulum.
e. It does not contain ribosomes.
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Question 7) What are the two types of endoplasmic reticulum called?
a. smooth and rough
b. intracellular and extracellular
c. ribbed and non-ribbed
d. long and short
e. rounded and flat
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Question 8) In a human cell, DNA may be found within
a. the nucleus
b. mitochondria
c. the cytoplasm
d. all of the above
e. none of the above
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Question 9) The endoplasmic reticulum can be thought of as a cellular factory that produces what two compounds?
a. DNA and RNA
b. organelles and protein
c. ATP molecules and lipids
d. ribosomes and ATP molecules
e. proteins and lipids
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Question 10) The smooth endoplasmic reticulum
a. is most abundant in cells specialized for protein secretion
b. gives rise to transport vesicles containing newly synthesized molecules wrapped in a layer of smooth ER membrane
c. consists of stacks of relatively flattened sacs called cristae
d. has only a few ribosomes attached to it
e. is a primary site for glycolysis
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