You are studying a cell structure that is approximately 100 nm in size. Which of the following provides the greatest magnification you can use to see this structure?
A) brightfield microscope
B) darkfield microscope
C) transmission electron microscope
D) phase-contrast microscope
E) scanning electron microscope
E
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A small number of birds arrive on an island from a neighboring larger island. This small population begins to adapt to the new food plants available on the island, and their beaks begin to change
About twice a year, one or two more birds from the neighboring island arrive. These new arrivals _____. A) speed up the process of speciation B) tend to promote adaptation to the new food plants C) tend to retard adaptation to the new food plants D) represent a colonizing event
Based on the function of mitochondria, what substance is able to pass through the outer membrane of the mitochondria easily?
A. Oxygen B. Sugars C. Amino acids D. Potassium ions
Which of the following is a result of a positive feedback?
a. childbirth b. heart rate increase during exercise c. body water regulation d. sweating when you get hot
Which of the following statements about the consequences of global warming are true? (Check all that apply.)A) The rate of global warming may be too great for populations to be able to adapt through natural selection.B) Rising sea levels will be a consequence of global warming.C) Global warming will cause a decrease in the incidence of diseases caused by mosquitoes.D) The frequency of El Niño events may increase as a consequence of global warming.E) Agricultural production will increase.
What will be an ideal response?