Exam (elaborations)
BIO 344 Quizzes Questions answers latest update
- Course
- Bio 344
- Institution
- University Of Texas - Austin
BIO 344 Quizzes Questions answers latest update
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BIO 344 QuizzesTransmembrane proteins need to cross the lipid bilayer. A secondary structure of
the polypeptide chain that is embedded in the bilayer is often: - alpha helix
Epithelial cells enclose and partition animal body by lining surfaces and cavities to
create internal compartments. Epithelial cells are structurally polarized. To keep
the cell polarized, it is necessary to prevent diffusion of molecules from one side
to the other. A barrier created by a specific type of intercellular junction, called a
_____________, can maintain separation of membrane proteins and lipids. - tight
junction
The picture illustrates the enzyme Phospholipase C catalyzing the converison of
PI(4,5)P2 to IP3 and Diacylglycerol. After the reaction, IP3 is found in the
__________ and Diacylglycerol is found _________ - cytosol, embeded in the
membrane
A difference between sphingomyelin and phosphatidylcholine is: - sphingomylein
is built from a sphingosine backbone and and phosphatidylserine is built from a
glycerol backbone
Sugar residues that are associated with glycolipids and glycoproteins embedded
in the plasma membrane are found:
A. on both sides of the membrane
B. on the side of the membrane facing away from the cell
, C. on the side of the membranes facing the cytosol
D. the plasma membrane does not contain glycoproteins
E. the plasma membrane does not contain glycolipids - on the side of the
membrane facing away from the cell
The molecule shown is: - a triacylglyceride
Cell surface receptors are transmembrane proteins. The amino acid side chains in
the region of the protein that cross the membrane are most likely to be -
Hydrophobic
The types enzyme that catalyzes the removal of a phosphate group from a
phosphorylated phospholipid in an ATP independent reaction is a: - lipid
phosphatase
Which of the following statement concerning lipid rafts are true? - they are a
thicker region of a membrane used to organize and concentrate membrane
proteins
Which of the following will spontaneously form bilayers when placed in an
aqueous environment? - phospholipids
MDR (multi-drug resistance) Protein: - is often over expressed in cancer cells
where it can pump certain hydrophobic drugs from the cytosol out of the cell
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