Miller and Urey's experiment provided support for what hypothesis? In what way did the discovery of hydrothermal vents alleviate concern about the validity of their simulation of the Earth's primitive atmosphere?
What will be an ideal response?
Miller and Urey's experimental findings supported Haldane and Oparin's hypotheses that the first organic molecules could have been produced from early atmospheric gases in the presence of strong energy sources. Their ideas are commonly referred to as abiotic synthesis. Many scientists were concerned that Miller and Urey included ammonia as one of the atmospheric gases, arguing that ammonia would have been scarce. A source of ammonia was verified with the discovery of hydrothermal vents on the ocean floor and the associated chemical reactions changing N2 to NH3.
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Which one of the following does NOT contribute to the incidence of nosocomial infections?
A) antibiotic resistance B) lapse in aseptic techniques C) gram-negative cell walls D) lack of handwashing E) lack of insect control
You have a friend who tells you she is lactose intolerant. She asks you to explain what this means. You say to her:
A) "You cannot digest milk because you do not have the enzyme to break down the sugar in the milk." B) "You cannot digest milk because you cannot absorb it in your intestines." C) "You cannot digest the milk because you do not have the enzyme to break down the lipid in the milk." D) "You cannot digest the milk because you do not have the enzyme to break down the protein in the milk." E) "You are allergic to milk."
Which kind of ground tissue, A, B, or C, would be best described as soft tissue most responsible for storage or photosynthesis?
1.A
2.B
3.C