Biology 380 - Cell Biology » Summer 2022 » Quiz 3, Ch 11 and 12

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Question #1
For which of the following ions is the intracellular concentration typically higher than the extracellular concentration?
A.   Calcium
B.   Sodium
C.   Potassium
D.   Magnesium
E.   Chloride
Question #2
In contrast to transporters, the channel proteins in cellular membranes
A.   form pores that are always open
B.   Undergo a conformational change every time they transport a solute
C.   Can only mediate passive transport
D.   Interact strongly with the solute(s) that they transport
Question #3
A mutation in a cell leads to it being unable to produce signal recognition particles (SRPs). What would be the most likely outcome of this mutation on the cell’s protein production? The cell would…
A.   Be unable to assemble functional ribosomes
B.   Be unable to transcribe DNA
C.   Not allow passage of mRNA through nuclear pores
D.   Stop producing secreted proteins
Question #4
A nuclear protein that has been taken out of the nucleus will be released from the receptor (delivered to the cytosol) when:
A.   The receptor binds Ran GTP
B.   The receptor binds Ran GDP
C.   The phosphate is removed from Ran GTP
D.   The receptor binds Ran GEF
Question #5
In order for glucose to be transported across epithelial cells (from intestinal lumen to the extracellular fluid) which of the following must be present?
A.   Na+/K+ pump on basal side. Glucose uniport on apical side
B.   Glucose/Na+ symporter on apical side. Tight junctions between adjacent cells on apical side. Na+/K+ pump on basal side
C.   Tight junctions between adjacent cells on apical side. Glucose uniport on apical side
D.   Glucose uniport on apical side. Tight junctions between adjacent cells on apical side

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