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PCB 4023 exam 1 Questions With Complete Solutions
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PCB 4023 exam 1 Questions With Complete Solutions
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PCB 4023 exam 1 Questions With Complete SolutionsA beaker in lab is filled with a cup of water (lower layer) and oil
(top layer). If you threw a bunch of phospholipids into the
beaker, they would assemble into what energetically favorable
form between the oil and water layers? (Note: Oil is non-polar)
A phospholipid monolayer
A phospholipid bilayer Correct Answer A phospholipid
monolayer
A lipid molecule has a large hydrophilic headgroup and a short,
single hydrophobic tail. When exposed to water, these lipid
molecules will form
bilayers
micelles Correct Answer micelles
A membrane protein harnesses the power of Solute A's
electrochemical gradient to move Solute B across a membrane
against Solute B's concentration gradient. The membrane protein
moves both solutes in the same direction.
This membrane protein is an example of:
A symporter carrying out passive transport
An antiporter carrying out passive transport
A symporter carrying out active transport
An antiporter carrying out active transport Correct Answer A
symporter carrying out active transport
A polar covalent bond is harder to break than a hydrogen bond.
,True
False Correct Answer True
A protein secreted to the plasma membrane will have the same
terminus exposed to the extracellular space that was initially
exposed to the the endoplasmic reticulum (ER) lumen.
True
False Correct Answer True
A scientist cultures cells that have membrane proteins tagged
with GFP and examines them using the Fluorescence Recovery
After Photobleaching (FRAP) technique. She bleaches a small
area of the membrane of one of the cells, waits, and then
observes the cell again. The bleached area has filled in,
indicating that
The GFP-tagged proteins are mobile
The GFP-tagged proteins are stationary
The bleaching procedure did not work
The wrong secondary antibody was used Correct Answer The
GFP-tagged proteins are mobile
A scientist is examining the histones associated with a stretch of
DNA containing a highly expressed gene. What histone state is
characteristic of what she is likely to find?
Option 1 (on the left)
Option 2 (on the right) Correct Answer Option 2 (on the right)
, A scientist transfers a bacterial culture plate a 37 deg C
incubator to a room maintained at 25 deg C. Which of the
following is LIKELY to happen to the cells' membranes:
Initial increase in membrane fluidity, which the bacteria then
compensate for
A change in the cholesterol: phospholipid ratio
Enhanced rate of synthesis of an enzyme that add carbons to
fatty acid chains
Enhanced rate of synthesis of desaturase, an enzyme that creates
double bonds in fatty acid chains Correct Answer Enhanced
rate of synthesis of desaturase, an enzyme that creates double
bonds in fatty acid chains
Apply your reasoning. Would you expect to find SRP receptors
in the smooth endoplasmic reticulum (ER) or not?
No, not in the smooth ER. I would only expect to find SRP
receptors in the rough ER.
Yes, I'd expect SRP receptors are spread evenly across the ER,
including the sooth ER. Correct Answer No, not in the smooth
ER. I would only expect to find SRP receptors in the rough ER.
ATP hydrolysis allows what step of protein refolding in a Hsp60
chamber to happen:
Entry of the misfolded protein into the Hsp60 chamber
The cap of proteins (GroES) binding and isolating the misfolded
protein in the chamber
The upward stretching of the Hsp60 chamber, exposing the
hydrophilic residues to the misfolded protein
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