Plasma membrane phospholipids are labeled with a fluorescent tag and then the phospholipids in one area are bleached with a laser beamto eliminate the fluorescent signal. What would one observe after the cell is incubated for a few minutes?
A. The bleached molecules would disappear into the cell.
B. The bleached molecules would diffuse laterally through the membrane and intermix with unbleached molecules.
C. The bleached molecules would remain in the spot where bleaching occurred.
D. All the bleached molecules would flip-flop across the cell membrane.
E. The bleached molecules would be released from the cell.
B. The bleached molecules would diffuse laterally through the membrane and intermix with unbleached molecules.
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Which of the following allows materials to diffuse
into body cells and allows organs to grow larger and move more freely? a. a coelom b. mesoderm c. a mantle d. a water-vascular system e. a saclike gut
Recently, the bones (not fossils) of a possible new species of humans (in the genus Homo) have been found on an island in Indonesia (an island nation southeast of Asia)
Using radiometric dating, scientists can show that these people were alive as recently as 17,000 years ago. According to the information in this chapter, why do you think they probably used tools?
One benefit of transpiration is that it:
a. concentrates nutrients in plant leaves. b. distributes nutrients throughout the plant. c. moves water from the atmosphere to the plant. d. is responsible for warming plants. e. brings in water from the soil.
Which of the following accumulates sulfur granules inside the cell?
A. Green sulfur bacteria B. Cyanobacteria C. Purple sulfur bacteria D. None of the choices are correct.