Pulmonary surfactant does all of the following except:a
reducing the cohesive forces of water molecules.
b. reducing the surface tension of water.
c. moving water across respiratory surfaces.
d. preventing the alveoli from collapsing.
e. reducing the energy required to stretch the lungs.
C
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Scientific knowledge is limited to physical explanations for observable events in the natural world
a. true b. false
In what portion of a eukaryotic cell is the majority of DNA isolated?
a. nucleus b. mitochondria c. vesicles d. cytoplasm e. lysosome
A microtubule-organizing center (MTOC)
A) contains centrioles in plant cells. B) serves as a site for both microtubule and intermediate filament assembly. C) anchors either end of cytoplasmic microtubules. D) anchors only the minus ends of cytoplasmic microtubules. E) usually is positioned near the cell membrane.
When the energy flow through an ecosystem is measured at each trophic level, ________ of the available energy passes from one level to the next.
A. 1% to 2% B. 5% to 20% C. 25% to 35% D. 36% to 45% E. 46% to 55%