At the beginning of a research project on egg laying in seagulls, a researcher noted that the birds laid an average of 7-9 eggs per clutch. After studying the population for 15 generations, the researcher noted that the birds were now laying 3-4 eggs per clutch. What type of natural selection is occurring in the population of gulls?
A. directional
B. stabilizing
C. disruptive
D. There is no selection occurring in this population.
Answer: A
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DNA sequencing using the Sanger method relies on:
A. the removal of specific bases from DNA. B. the termination of DNA synthesis at specific bases. C. the addition of specifically labeled phosphates to the DNA. D. the detection of protons during DNA synthesis. E. the detection of electromagnetic signatures of specific bases in DNA.
Ten angstroms (Å) is equivalent to _____________¬_ microns (µm)
A. 10.0 B. 1.0 C. 0.1 D. 0.01 E. 0.001
Nutrient poor soils and dominant evergreen
angiosperm trees dominate this biome.
a. boreal forests b. chaparral c. deserts d. tropical rain forests e. temperate deciduous forests
Solutions that are isotonic:a
are not in dynamic equilibrium. b. have equal concentrations of solute and water. c. have equal concentrations of solute but not water. d. have equal concentrations of water but not solute. e. will exhibit a net movement of water from one solution to the other.