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.   Potassium
B.   Sodium
C.   Chloride
D.   Magnesium
E.   Calcium
Question #2
In contrast to transporters, the channel proteins in cellular membranes
A.   Can only mediate passive transport
B.   Undergo a conformational change every time they transport a solute
C.   Interact strongly with the solute(s) that they transport
D.   form pores that are always open
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.   Not allow passage of mRNA through nuclear pores
B.   Be unable to assemble functional ribosomes
C.   Be unable to transcribe DNA
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 phosphate is removed from Ran GTP
C.   The receptor binds Ran GEF
D.   The receptor binds Ran GDP
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.   Tight junctions between adjacent cells on apical 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.   Glucose uniport on apical side. Tight junctions between adjacent cells on apical side
D.   Na+/K+ pump on basal side. Glucose uniport on apical side

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