Why do populations evolve?
a. Populations evolve because they want to.
b. Populations evolve because they need to.
c. Populations evolve because of natural selection.
d. Populations evolve because of speciation.
c. Populations evolve because of natural selection.
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The first product to be commercially treated by pasteurization was
A. wine B. cheese C. milk D. beer
There is a population of beetles that typically have black wings. A scientist studying these beetles knows that their eggs hatch in early spring, the young insects grow through the late spring and summer, they lay eggs in the early fall and they die in the early winter. Recently some beetles have been born with white wings. Early in life, the black- and white-winged beetles seem to be very similar in number of mating events, eggs laid, and survival rates, but shortly after laying their eggs the white beetles die and there are only black-winged beetles during the late fall. Which of the following is a true statement about the beetles?
A) White- and black-winged beetles have equal fitness. B) Black-winged beetles have a higher fitness than white-winged beetles. C) The number of baby white-winged beetles will decrease in frequency over time. D) White wings are an adaptation.
A bacterium, such as E.coli is extremely sensitive to changes in its environment. Which of the following changes might a bacterium have to perceive and respond to?
a) change in the light intensity of the intracellular environment b) change in the pH of the intracellular environment c) increase in the surface area of the cell wall d) change in the solute concentration in the extracellular environment e) increase in electric impulses
Oligotrophic lakes
A) remove nutrient-rich sediments from field runoff. B) support dense plant communities. C) provide breeding grounds for many fish and crustacean species. D) have low levels of nutrients and few organisms. E) depend on sulfur bacteria as the primary producers.