Plasma Membrane Structure, Fluid Mosaic Model (2A)
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QUESTION
Which solute crosses a pure phospholipid bilayer most readily:
b
1
b^1
b
1
)
b
d
bd
b
d
a
+
^+
+
,
b
2
b^2
b
2
) glucose,
b
3
b^3
b
3
)
O
2
O_2
O
2
,
b
4
b^4
b
4
)
H
2
O
H_2O
H
2
O
?
QUESTION
Which solute crosses a pure phospholipid bilayer most readily:
b
1
b^1
b
1
)
b
d
bd
b
d
a
+
^+
+
,
b
2
b^2
b
2
) glucose,
b
3
b^3
b
3
)
O
2
O_2
O
2
,
b
4
b^4
b
4
)
H
2
O
H_2O
H
2
O
?
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ANSWER
O
2
O_2
O
2
. As a small nonpolar gas,
O
2
O_2
O
2
diffuses easily through the hydrophobic bilayer core, unlike charged ions or polar molecules like glucose and water.
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