You drop a handful of common table salt into a glass of water. Which of the following best describes what is happening inside the glass at the molecular level?
A) The positively charged hydrogen ends of the water molecules are attracted to sodium ions.
B) Sodium and chloride ions form a covalent bond.
C) The positively charged hydrogen ends of the water molecules are attracted to chloride ions.
D) Water and sodium form a covalent bond.
C
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In the disease elephantiasis, lymph vessels become blocked as a result of infection with parasitic worms. Which of the following processes would be impacted by this disease?
A. the return of excess interstitial fluid to the bloodstream B. the diffusion of water and small molecules across the wall of the capillary C. the flow of water back into the capillaries by osmosis D. the generation of pressure to filter materials through the capillary walls E. the exchange of oxygen and other materials between the blood and body cells
Boiling is not reliable for sterilization because
A. heat-sensitive instruments may be destroyed. B. heat-resistant endospores are unaffected. C. water boils at a higher temperature at lower altitudes. D. viruses are more sensitive to heat than bacteria.
Which of the following components is not a surface barrier serving as the first line of defense?
What will be an ideal response?
Surplus individuals in the __________ disperse and find another habitat in which to settle and
reproduce. a. metahabitats b. sink habitats c. source populations d. source habitats e. K-selected populations