Biology, Eighth Edition (Raven)

Chapter 5: Membranes

Post Test

1
Which is the most likely role for a glycoprotein in a cell's membrane? (p. 87)
A)It serves for cell-to-cell recognition.
B)It stabilizes the inner face of the membrane.
C)They provide passage for substances and information to the cell's interior.
D)It is a member of the flexible matrix which increases the membrane's ability to act as a barrier.
E)All of the above are equally likely roles.
2
What feature of the fatty acids cause phospholipids to aggregate spontaneously? (p. 90)
A)They form ionic bonds with adjacent molecules in the plane of the membrane.
B)They have intense Van Der Waals interactions with other fatty acids.
C)The C-H bonds are nonpolar covalent bonds, and thus prevent phospholipids from entering the aqueous region near the "heads".
D)Their ester linkages to glycerol provide hydrogen bonding just under the polar "head".
E)They attract half the amount of water that the polar heads do, thereby giving them room to "stick together".
3
For a transmembrane protein, which of the following amino acid side chains would be found in the alpha helical region near the fatty acids? (p. 92)
A)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::Chapter 5 Image 3a::/sites/dl/free/9834092339/415834/Image1.gif','popWin', 'width=70,height=110,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif">Chapter 5 Image 3a (1.0K)</a>Chapter 5 Image 3a
B)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::Chapter 5 Image 3b::/sites/dl/free/9834092339/415834/Image2.gif','popWin', 'width=113,height=115,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif">Chapter 5 Image 3b (1.0K)</a>Chapter 5 Image 3b
C)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::Chapter 5 Image 3c::/sites/dl/free/9834092339/415834/Image3.gif','popWin', 'width=97,height=124,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif">Chapter 5 Image 3c (1.0K)</a>Chapter 5 Image 3c
D)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=gif::Chapter 5 Image 3d::/sites/dl/free/9834092339/415834/Image4.gif','popWin', 'width=93,height=141,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif">Chapter 5 Image 3d (1.0K)</a>Chapter 5 Image 3d
E)It cannot be determined from the information given.
4
If a paramecium is moved from a solution of dilute salt to distilled water, which of the following effects will be seen? (p. 97)
A)The contractile vacuole will pulse more quickly.
B)The contractile vacuole will pulse more slowly.
C)The cilia will move more quickly.
D)The nucleus will enlarge.
E)B and C are both logical consequences.
5
Which of the following will happen to a coupled transport system when ATP is exhausted? (p. 99)
A)Diffusion of the cotransported materials will increase.
B)Transport of the specific substance would cease.
C)Phagocytosis will take over the task of transporting material.
D)All of the above will occur.
E)None of the above will occur.
6
The main difference between phagocytosis and pinocytosis is (p. 100)
A)Pinocytosis is possible in leukocytes (white blood cells), while phagocytosis is not.
B)Pinocytosis occurs in eukaryotes, while phagocytosis occurs in prokaryotes.
C)Pinocytosis is less specific in the substances it accumulates than phagocytosis.
D)Phagocytosis is driven by active transport, while pinocytosis uses diffusion.
E)All of the above can distinguish between phagocytosis and pinocytosis.
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