Each of the following is a function of membranes except
A) defining cell and organelle boundaries.
B) sites for specific biochemical functions.
C) information storage.
D) regulation of transport.
E) cell-cell communication. - ANS C) information storage.
Each of the following is a model for membrane structure except
A) Overton lipid coat.
B) Langmuir monolayer.
C) Gorter and Grendel bilayer.
D) Singer and Nicholson fluid mosaic.
E) Watson and Crick double helix. - ANS E) Watson and Crick double helix.
In response to temperature changes, cell membranes change state to become more solid or
more fluid by undergoing
A) lipid raft formation.
B) membrane folding.
C) a phase transition.
D) transverse diffusion.
E) differential scanning calorimetry. - ANS C) a phase transition.
When a mouse cell and a human cell with different cell-surface protein markers are fused using
polyethylene glycol (PEG) and immediately placed at 0°C, what would you expect happens to
the mouse and human marker proteins?
A) Both the mouse and human marker proteins will rapidly disperse evenly throughout the fused
membrane.
B) Only the mouse cell marker proteins will disperse throughout the fused membrane; the
human marker proteins will remain confined to the original human region of the fused
membrane.
C) The mouse and human markers will migrate to opposite poles of the fused membrane.
D) The mouse and human markers will migrate little and remain confined to their original
membrane regions.
E) Both mouse and human markers will be endocytosed by the fused cell and destroyed in the
fused cell. - ANS D) The mouse and human markers will migrate little and remain confined to
their original membrane regions.
Of the following molecules, which would you predict diffuses most readily across membranes?
A) water
B) glucose
, C) oxygen
D) serine
E) hydrogen ions - ANS C) oxygen
Which of the following molecules enters kidney cells via a specific transporter?
A) water
B) carbon dioxide gas
C) cholesterol
D) ethanol
E) oxygen - ANS A) water
Each of the following is a type of cell-cell junctions except
A) adhesive.
B) tight.
C) gap.
D) plasmodesmata.
E) All are cell-cell junctions. - ANS E) All are cell-cell junctions.
When examining an electron micrograph of cells obtained from a new deep-sea life-form, you
notice that the plasma membranes appear as two dark lines separated by a lightly stained
region. Which of the following investigator(s) used a similar observation as the basis for a model
of membrane structure?
A) Robertson
B) Gorter and Grendel
C) Unwin and Henderson
D) Overton
E) Singer and Nicolson - ANS A) Robertson
Which of the following proposed the "sandwich" model of membranes, in which lipid bilayers are
coated on both sides with thin sheets of proteins?
A) Overton
B) Langmuir
C) Gorter and Grendel
D) Davson and Danielli
E) Robertson - ANS D) Davson and Danielli
The composition of lipids in the outer and inner monolayers of cell membrane lipid bilayers is
A) asymmetrical; i.e., different in each monolayer.
B) identical in each monolayer.
C) twice as concentrated in the inner monolayer as in the outer monolayer.
D) highly random for each monolayer.
E) the same for all cell plasma membranes but different from the composition in mitochondrial
and chloroplast membranes. - ANS A) asymmetrical; i.e., different in each monolayer.
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