Unformatted text preview: 25.The key feature of biological membranes that allows the cells they enclose to
send and receive molecular signals to and from other cells is that a? they consist of a thin sheet of water between two layers of lipid.
b. their polar head groups readily conduct electricity. fr? each cell’s membrane is packed with diverse proteins. “11/ they are hydrophobic outside and hydrophilic inside.
e/they are a ﬂeet of carbohydrates bobbing in sea of proteins. 26.A mutant plant lacking Photosystem I would have difﬁculty making any ATP in the cholorplast. keeping the Calvin Benson Cycle running.
c. generating enough oxygen to survive.
@Z jump-starting chloroplast electron transport.
e. not drowning in all the un—split water. 27.What is a reasonable conclusion to draw from the data plotted below? 100 Action (“M --
Absorptlon (7-) - - - - 0
400 50” m m - Wavelength (nm) a.» The pigment analyzed is irrelevant to the action under study.
([3) There are likely to be other pigments involved in this process.
0. The pigment analyzed would look blue to our eyes. d. The action analyzed requires at least three pigments. e. The pigment is only involved in Photosystem l but not ll. 28.A plant lacking carotenoid pigments in its photosystems would E7 reﬂect more light in the orange part of the spectrum. - not be able to exploit sunlight’s range of wavelengths as well. c. perform photosynthesis just ﬁne, since only chlorophyll is needed.
d. perform photosynthesis better without carrot pigments in the way.
e. not be able to pass electrons to the ﬁrst acceptor in the chain. 8 ...
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- Spring '08