What happens when phospholipids are placed in an aqueous solution?
a. They disperse throughout the solution and form polar bonds with other organic molecules
present in the solution.
b. They move to the water's surface and form a single-layered membrane between the water
and the atmosphere.
c. They repel one another.
d. They spontaneously form bilayers.
e. The hydrophobic tales force the phospholipids to form "beads" at the surface, much like
you see when vegetable oil is added to an aqueous solution.
D
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Birds, like mammals, can regulate their body temperatures within close limits. Therefore birds and mammals are called
A. ectothermic. B. poikilothermic. C. endothermic. D. heterothermic.
Which is the chemical bond formed when an electron is shared between two elements?
a. Ionic bond b. Covalent bond c. Electronic bond d. Hydrogen bond
All of the following are evolutionary trends in the development of nervous systems for bilaterally
symmetrical animals except:a. an increased number of neurons. b. concentration of neurons. c. specialization of function. d. simplistic synaptic contacts allowing integration. e. cephalization.
You suspect a 100-nm structure is present in a cell. Which of the following provides the lowest magnification that you can use to see this structure?
a. Transmission electron microscope b. Phase-contrast microscope c. Scanning electron microscope d. Brightfield microscope e. Darkfield microscope