For each of the following statements, specify which one of the five general memb

Question

For each of the following statements, specify which one of the five general membrane functions (permeability barrier, localization of function, regulation of transport, detection of signals, or intercellular communication) the statement illustrates. (0.1 point each)

a.When cells are disrupted and fractionated into subcellular components, the enzyme of cytochrome P-450 is recovered with the endoplasmic reticulum fraction.

b.On their outer surface tissue, cells of multicellular organisms carry specific glycoproteins that are responsible for cell-cell adhesion.

c.The interior of a membrane consists primarily of the hydrophobic portions of phospholipids and amphipathic proteins.
Permeability barrier

d. Photosystems I and II are embedded in the thylakoid membrane of the chloroplast.

e. All of the acid phosphatase in a mammalian cell is found within the lysosomes.

f. The membrane of a plant root cell has an ion pump that exchanges phosphate inward for bicarbonate outward.

g. The inner mitochondrial membrane contains an ATP-ADP carrier protein that couples outward ATP movement to inner ADP movement.

h. Insulin does not enter a target cell but instead binds to a specific membrane receptor on the external surface of the membrane, thereby activating the enzyme adenylyl cyclase on the inner membrane surface.

Explanation / Answer

a. When cells are disrupted and fractionated into subcellular components, the enzyme of cytochrome P-450 is recovered with the endoplasmic reticulum fraction. - localization of function

b. On their outer surface tissue, cells of multicellular organisms carry specific glycoproteins that are responsible for cell-cell adhesion. - detection of signals

c. The interior of a membrane consists primarily of the hydrophobic portions of phospholipids and amphipathic proteins. - Permeability barrier

d. Photosystems I and II are embedded in the thylakoid membrane of the chloroplast. - localization of function

e. All of the acid phosphatase in a mammalian cell is found within the lysosomes. - localization of function

f. The membrane of a plant root cell has an ion pump that exchanges phosphate inward for bicarbonate outward. - permeability barrier

g. The inner mitochondrial membrane contains an ATP-ADP carrier protein that couples outward ATP movement to inner ADP movement. - regulation of transport

h. Insulin does not enter a target cell but instead binds to a specific membrane receptor on the external surface of the membrane, thereby activating the enzyme adenylyl cyclase on the inner membrane surface. - intercellular communication

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