Exercise: Membrane Structure And Functions

Questions for: Membrane Structure And Functions

The membrane proteins that catalyze active transport reactions differ from soluble enzymes as
A:
they are permanently changed during the reaction
B:
the substrates of the reaction are all outside the cell
C:
they do not enhance the rates of reaction
D:
the products of the reaction move in a specific direction
Answer: D
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Exocytosis is the secretion of proteins
A:
out of the cell across the plasma membrane into the extracellular space
B:
out of the cell across the plasma membrane into the intracellular space
C:
is the uptake of macromolecules from the extracellular space into the cell across the plasma membrane
D:
is the uptake of macromolecules from the intracellular space into the cell across the plasma membrane
Answer: A
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Pinocytosis occurs in
A:
all eukaryotic cells
B:
all prokaryotic cells
C:
mitochondria of all cells
D:
none of these
Answer: A
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Membrane lipids are
A:
hydrophilic
B:
hydrophobic
C:
ampiphillic
D:
none of these
Answer: A
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In Fluid mosaic model, the biological membrane can be viewed as
A:
two dimensional solutions of oriented lipids and globular proteins
B:
three dimensional solutions of oriented lipids and globular proteins
C:
two dimensional solutions of oriented lipids and carbohydrate
D:
three dimensional solutions of oriented lipids and carbohydrate
Answer: A
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