Cells are able to control the composition of their cytoplasm and internal compartments because cellular membranes
A) are selective barriers.
B) lack membrane-spanning proteins.
C) protect the cell interior.
D) are selective barriers and protect the cell interior.
E) allow water to diffuse in and out of the cell.
Correct Answer:
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Q2: The features of molecules that affect their
Q3: Diffusion is
A) an active process.
B) driven by
Q4: The rate of net diffusion of a
Q5: The phospholipid bilayer of membranes is highly
Q6: The diffusive force for a charged substance
Q7: If the electrical and concentration gradients draw
Q8: Facilitated diffusion
A) can be an active or
Q9: The principal difference between transmembrane carriers and
Q10: Transmembrane carrier proteins
A) undergo radical conformational change
Q11: Electrical impulses are conducted using
A) simple diffusion.
B)
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