If a substance can cross a membrane, the membrane is _____to that substance.
Fill in the blank(s) with correct word
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Question 2) Collagen
a. provides tensile strength to the cytoskeleton
b. is most abundant in tissues that stretch and then recoil
c. forms the intercellular filaments of desmosomes
d. is the most abundant protein in the ECM
e. all of these
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Question 3) A(n) ____________________ is made up of six protein subunits arranged in a hollow, tube-like structure that extends through the thickness of the plasma membrane.
Fill in the blank(s) with correct word
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Question 4) Which one of the following requires assisted membrane transport?
a. Glucose moving into a cell
b. K+ ions moving out of a cell
c. Water moving toward a hypertonic solution
d. Movement of ECF into a cell via pinocytosis
e. Movement of Na+ through a symporter
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Question 5) Transcellular transport across the cell is regulated by ____________________ and ____________________ proteins.
Fill in the blank(s) with correct word
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Question 6) Which statement about membrane proteins is incorrect?
a. Channels are water-filled pathways.
b. Channels are not highly selective.
c. Carriers are highly selective.
d. CAMs serve as binding sites for specific ions.
e. Proteins may work in conjunction with carbohydrates to provide recognition of self.
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Question 7) ____________________ act like spot rivets that anchor together two adjacent but non-touching cells.
Fill in the blank(s) with correct word
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Question 8) Integrins
a. create a filamentous meshwork in the inner surface of the membrane
b. act as membrane-bounded enzymes
c. are used for cell recognition purposes
d. span the membrane and link the plasma membrane and the cell's surrounding
e. do not exhibit any of the above characteristics
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Question 9) ____________________ promotes cell adhesion and holds cells in position.
Fill in the blank(s) with correct word
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Question 10) Cystic fibrosis is caused by abnormal
a. accumulation of mucus
b. levels of insulin
c. chloride channels in plasma membranes
d. potassium channels in plasma membranes
e. sodium-potassium pumps
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