Pulmonary surfactant functions by:
a. increasing the cohesive forces of water molecules.
b. increasing the surface tension of water.
c. moving water across respiratory surfaces.
d. preventing the alveoli from expanding.
e. increasing the energy required to stretch the lungs.
c
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Although molecular methods are available, such as polymerase chain reaction (PCR) for identifying the Bartonella species, limitations exist. One limitation to testing is the specificity of:
a. probes. b. polymerases. c. primers. d. restriction enzymes.
What role does wind play in desertification?
a. Wind disperses seeds. b. Wind blows away topsoil. c. Wind impedes grass growth. d. Wind damages mature grasses of grasslands. e. Wind causes drought.
Features that contributed to success on land include __________ and __________ (two types of vascular tissues). Fill in the blank(s) with the appropriate word(s)
The replication illustrated here is termed
a. dominant. b. recessive. c. semiconservative. d. conservative. e. hemiconservative.