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Mastering Biology - Cellular membranes Exam Questions and Answers
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Mastering Biology - Cellular membranes Exam Questions and Answers
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Mastering Biology - Cellular membranesExam Questions and Answers
-Because membranes are fluid, membrane proteins and phospholipids can drift about in
the membrane.
-The diverse proteins found in and attached to membranes perform many important
functions.
-The framework of a membrane is a bilayer of phospholipids with their hydrophilic heads
facing the aqueous environment inside and outside of the cell and their hydrophobic
tails clustered in the center. - Answer -Which statements about the fluid mosaic
structure of a membrane are correct? Select the three correct statements.
-Because membranes are fluid, membrane proteins and phospholipids can drift about in
the membrane.
-The diverse proteins found in and attached to membranes perform many important
functions.
-The kinky tails of some proteins help keep the membrane fluid by preventing the
component molecules from packing solidly together.
-Membranes include a mosaic, or mix, of carbohydrates embedded in a phospholipid
bilayer.
-The framework of a membrane is a bilayer of phospholipids with their hydrophilic heads
facing the aqueous environment inside and outside of the cell and their hydrophobic
tails clustered in the center.
-the similarity of the drug molecule to other molecules that are transported into the
target cells - Answer -Which of the following would be a factor that determines whether
the molecule selectively enters the target cells?
-the concentration of the drug molecule that is transported in the blood
-the similarity of the drug molecule to other molecules that are transported into the
target cells
-the phospholipid composition of the target cells' plasma membrane
-the nonpolar, hydrophobic nature of the drug molecule
more concentrated, less concentrated - Answer -When molecules move down their
concentration gradient, they move from where they are _____ to where they are _____.
Passive transport - Answer -Diffusion across a biological membrane is called ______.
The polarity of membrane phospholipids - Answer -Which of the following factors does
not affect membrane permeability?
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