Biology 1201 Exam 2- (Debanjana
Bhattacharya) UPDATED Exam
Questions and CORRECT Answers
_________________ transport of small molecules doesn't require energy: it may involve
transport proteins. - CORRECT ANSWER - Passive
_________ transport moves large molecules. - CORRECT ANSWER - Bulk
__________ transport of small molecules requires energy and a transport protein - CORRECT
ANSWER - Active
_______________________ is when large molecules are secreted when a vesicle fuses with the
plasma membrane.
_______________________ is when large molecules are taken in when the plasma membrane
pinches inward, forming a vesicle. - CORRECT ANSWER - Exocytosis, Endocytosis
Membranes are composed of mainly ________________________. - CORRECT
ANSWER - Phospholipids
Phospholipids are _________________ molecules, containing hydrophobic (water fearing) and
hydrophilic (water loving) regions. - CORRECT ANSWER - Amphipathic
Phospholipids from a bilayer with ___________________ tails inside the membrane and
_____________________ heads exposed to water on either side. - CORRECT ANSWER -
Hydrophobic, Hydrophilic
Lipids and proteins are the main component of ____________________, but carbohydrates are
also important. - CORRECT ANSWER - Membranes
,Hydrophilic regions of the protein are oriented toward the ____________ and
________________________________ _____________ inside and outside the membrane. -
CORRECT ANSWER - Cytosol, Extracellular Fluid
The arrangement of phospholipids and proteins in biological membranes is described by the
___________ ____________ model. - CORRECT ANSWER - Fluid Mosaic
In the ______________ ______________ model, the membrane is a fluid structure with a
"mosaic" of various proteins embedded in or attached to a double layer (bilayer) of
phospholipids. - CORRECT ANSWER - Fluid Mosaic
Membranes are held together by weak ________________ interactions. - CORRECT
ANSWER - Hydrophobic
Membrane fluidity of influenced by _______________________. - CORRECT
ANSWER - Temperature
Membranes rich in ________________________ fatty acids are more fluid than those dominated
by ___________________ fatty acids because kinks in the ______________________ fatty acid
tails at the locations of the double bonds prevents tight packing. - CORRECT ANSWER -
Unsaturated, Saturated, Unsaturated
__________________ acts as a "fluidity buffer" for membranes by resisting changes in
membrane fluidity as temperature changes. - CORRECT ANSWER - Cholesterol
To work properly with active enzymes and appropriate permeability, membranes must be about
as fluid as _________ oil. - CORRECT ANSWER - Salad
A _____________________ is a collage of different proteins embedded in the fluid matrix of the
lipid bilayer. - CORRECT ANSWER - Membrane
,There are two major populations of membrane proteins: _____________ and
_____________________. - CORRECT ANSWER - Integral and Peripheral
______________ proteins penetrate the hydrophobic interior of the lipid bilayer, usually
completely spanning the membrane as transmembrane proteins. - CORRECT ANSWER -
Integral
The __________________ regions embedded in the membrane's interior consist of stretches of
nonpolar amino acids, usually coiled into α helices. - CORRECT ANSWER - Hydrophobic
______________ proteins are not embedded in the lipid bilayer at all. Instead, they are loosely
bound to the surface of the membrane, often to integral proteins. - CORRECT ANSWER -
Peripheral
On the extracellular side of the membrane, some membrane proteins (e.g. integrins) attach to the
fibers of the _______________________ _____________. - CORRECT ANSWER -
Extracellular Matrix
The proteins of the plasma membrane have six major functions:
1.______________ of specific solutes into or out of cells
2.______________ __________, sometimes catalyzing one of a number of steps of a metabolic
pathway
3._________ __________________, relaying hormonal messages to the cell
4.____________ ________________, allowing other proteins to attach two adjacent cells
together
5._________________ ___________ of adjacent cells with gap or tight junctions
6.____________________________________________________________________________
__, maintaining cell shape and stabilizing the location of certain membrane proteins - CORRECT
ANSWER - Transport, Enzymatic Activity, Signal Transduction, Cell-Cell Recognition,
Intercellular joining, Attachment to the cytoskeleton and Extra Cellular Matrix
, _______________ are carbohydrates bonded to lipids. - CORRECT ANSWER -
Glycolipids
____________________ are carbohydrates bonded to proteins. - CORRECT ANSWER -
Glycoproteins
The four human blood groups (A, B, AB, and O) differ in the carbohydrate part of
__________________ on the surface of red blood cells. - CORRECT ANSWER -
Glycoproteins
True or False: The plasma membrane controls the exchange of materials between the cell and its
surroundings. - CORRECT ANSWER - True
Plasma membranes exhibit _____________ permeability; some substances cross more easily
than others - CORRECT ANSWER - Selective
_______________ molecules dissolve in the lipid bilayer and pass through the membrane
rapidly. Ex: Carbon Dioxide and Oxygen - CORRECT ANSWER - Hydrophobic
(nonpolar)
The hydrophobic interior of the membrane impedes the passage of ____________________
molecules. Ex: sugars, water, and ions pass through slowly if at all - CORRECT
ANSWER - Hydrophilic (polar)
_____________ assist and regulate the transport of ions and polar molecules. - CORRECT
ANSWER - Proteins
Hydrophilic substances cross membranes more quickly by passing through ________________
proteins. - CORRECT ANSWER - Transport
________________ proteins have a hydrophilic channel that certain molecules or ions can use as
a tunnel. - CORRECT ANSWER - Channel
Bhattacharya) UPDATED Exam
Questions and CORRECT Answers
_________________ transport of small molecules doesn't require energy: it may involve
transport proteins. - CORRECT ANSWER - Passive
_________ transport moves large molecules. - CORRECT ANSWER - Bulk
__________ transport of small molecules requires energy and a transport protein - CORRECT
ANSWER - Active
_______________________ is when large molecules are secreted when a vesicle fuses with the
plasma membrane.
_______________________ is when large molecules are taken in when the plasma membrane
pinches inward, forming a vesicle. - CORRECT ANSWER - Exocytosis, Endocytosis
Membranes are composed of mainly ________________________. - CORRECT
ANSWER - Phospholipids
Phospholipids are _________________ molecules, containing hydrophobic (water fearing) and
hydrophilic (water loving) regions. - CORRECT ANSWER - Amphipathic
Phospholipids from a bilayer with ___________________ tails inside the membrane and
_____________________ heads exposed to water on either side. - CORRECT ANSWER -
Hydrophobic, Hydrophilic
Lipids and proteins are the main component of ____________________, but carbohydrates are
also important. - CORRECT ANSWER - Membranes
,Hydrophilic regions of the protein are oriented toward the ____________ and
________________________________ _____________ inside and outside the membrane. -
CORRECT ANSWER - Cytosol, Extracellular Fluid
The arrangement of phospholipids and proteins in biological membranes is described by the
___________ ____________ model. - CORRECT ANSWER - Fluid Mosaic
In the ______________ ______________ model, the membrane is a fluid structure with a
"mosaic" of various proteins embedded in or attached to a double layer (bilayer) of
phospholipids. - CORRECT ANSWER - Fluid Mosaic
Membranes are held together by weak ________________ interactions. - CORRECT
ANSWER - Hydrophobic
Membrane fluidity of influenced by _______________________. - CORRECT
ANSWER - Temperature
Membranes rich in ________________________ fatty acids are more fluid than those dominated
by ___________________ fatty acids because kinks in the ______________________ fatty acid
tails at the locations of the double bonds prevents tight packing. - CORRECT ANSWER -
Unsaturated, Saturated, Unsaturated
__________________ acts as a "fluidity buffer" for membranes by resisting changes in
membrane fluidity as temperature changes. - CORRECT ANSWER - Cholesterol
To work properly with active enzymes and appropriate permeability, membranes must be about
as fluid as _________ oil. - CORRECT ANSWER - Salad
A _____________________ is a collage of different proteins embedded in the fluid matrix of the
lipid bilayer. - CORRECT ANSWER - Membrane
,There are two major populations of membrane proteins: _____________ and
_____________________. - CORRECT ANSWER - Integral and Peripheral
______________ proteins penetrate the hydrophobic interior of the lipid bilayer, usually
completely spanning the membrane as transmembrane proteins. - CORRECT ANSWER -
Integral
The __________________ regions embedded in the membrane's interior consist of stretches of
nonpolar amino acids, usually coiled into α helices. - CORRECT ANSWER - Hydrophobic
______________ proteins are not embedded in the lipid bilayer at all. Instead, they are loosely
bound to the surface of the membrane, often to integral proteins. - CORRECT ANSWER -
Peripheral
On the extracellular side of the membrane, some membrane proteins (e.g. integrins) attach to the
fibers of the _______________________ _____________. - CORRECT ANSWER -
Extracellular Matrix
The proteins of the plasma membrane have six major functions:
1.______________ of specific solutes into or out of cells
2.______________ __________, sometimes catalyzing one of a number of steps of a metabolic
pathway
3._________ __________________, relaying hormonal messages to the cell
4.____________ ________________, allowing other proteins to attach two adjacent cells
together
5._________________ ___________ of adjacent cells with gap or tight junctions
6.____________________________________________________________________________
__, maintaining cell shape and stabilizing the location of certain membrane proteins - CORRECT
ANSWER - Transport, Enzymatic Activity, Signal Transduction, Cell-Cell Recognition,
Intercellular joining, Attachment to the cytoskeleton and Extra Cellular Matrix
, _______________ are carbohydrates bonded to lipids. - CORRECT ANSWER -
Glycolipids
____________________ are carbohydrates bonded to proteins. - CORRECT ANSWER -
Glycoproteins
The four human blood groups (A, B, AB, and O) differ in the carbohydrate part of
__________________ on the surface of red blood cells. - CORRECT ANSWER -
Glycoproteins
True or False: The plasma membrane controls the exchange of materials between the cell and its
surroundings. - CORRECT ANSWER - True
Plasma membranes exhibit _____________ permeability; some substances cross more easily
than others - CORRECT ANSWER - Selective
_______________ molecules dissolve in the lipid bilayer and pass through the membrane
rapidly. Ex: Carbon Dioxide and Oxygen - CORRECT ANSWER - Hydrophobic
(nonpolar)
The hydrophobic interior of the membrane impedes the passage of ____________________
molecules. Ex: sugars, water, and ions pass through slowly if at all - CORRECT
ANSWER - Hydrophilic (polar)
_____________ assist and regulate the transport of ions and polar molecules. - CORRECT
ANSWER - Proteins
Hydrophilic substances cross membranes more quickly by passing through ________________
proteins. - CORRECT ANSWER - Transport
________________ proteins have a hydrophilic channel that certain molecules or ions can use as
a tunnel. - CORRECT ANSWER - Channel
