Cell Transport Exam Deck COPY Flashcards
Proteins in a membrane are
a. integral if they are embedded in the membrane and protrude from both surfaces of the bilayer
b. peripheral if they are on the inside surface held in place by the cytoskeleton
c. integral if they protrude from only one surface of the the bilayer
d. all of the choices are correct
D
Active Transport
a. requires an input of ATP
b. occurs in osmosis and facilitated transport
c. is inovlved in diffusion
d. all the choices correct
A
the channel protein that acount for why water can cross a membrane more quickly than expected is
a. aquaporin
b. integrin
c. the sodium potassium pump
d. ATP Synthetase
A
In a phospolipid bilayer the
a. fatty acid tails are hydrophilic
b. fatty acid tails are ionized
c. proteins are located only between the two layers
d. phosphate groups are hydrophobic
e. phosphate heads are oriented toward the exterior of tthe cell or toward the cytoplasm
E
Which statement is true about teh plasma membrane?
a. The fluid nature of the membrane is regulated by the flip-flopping of the phospholipids from one side of the membrane to the otther.
b. proteins and phospholipids can move sideways within the plane of the membrane
c. the model can be likened to a sandwich where phospholipids are like the bread and proteins are like the filing
d. The proteins make up the matrix of the membrane
B
Which statement is NOT true about the proteins in the plasma membrane?
a. glycoproteins contain carbohydrate chains that are oriented toward the inner surface of the membrane.
b. some peripheral proteins are connected to the cytoskeletal filaments
c. proteins may be attached to the inner surface of the plasma membrane
d. the hydrophobic portion of a protein is embedded within the membrane
e. integral proteins are responsible for membrane function
A
Which phrase does NOT describe one of the functions of proteins of the plasma membrane?
a. acting as a receptor for substances external to the cell
b. forming a channel through the membrane
c. binding to a substance to carry it through the membrane
d. initiating the replication of the genetic material
e. increasing the rate of chemical reaction
D
Red blood cells come in many “blood types” including A, B, AB, O (lacking proteins A and b), Rh positive, Rh negative (lacking Rh +) and many others. If blood is transfused, the recipient detects any new or “foreign” proteins. These blood type proteins are:
a. on the outer surface of the red blood cell membrane
b. inside the red blood cell cytoplasm
c. evernly distributed throughout the cell contents and plasma
d. in the red cell nucleus
e. in the plasma secreted by the red cell
A
Whether a molecule can cross the plasma membrane depends upon:
a. the chemical properties of the molecule
b. the charge of the molecule
c. the size of the molecule
d. the shape of the molecule
e. all of the above
E
If a cell is place in a hypotonic solution, which will occur?
a. Water will move out of the cell into the surrounding solution
b. water will move into the cell from teh surrounding solution
c. . Salts will move out of the cell into the surrounding solution
b. Salts will move into the cell from teh surrounding solution
B
Which is the best definition of osmosis?
The movement of water across a semi-permeable membrane from an area of higher water concentration to an area of lower water concentration
Which type of molecule will require some amount of energy to cross the cell membrane?
Polar
