If an organism has a relatively large number of Hox genes in its genome, it most likely _____
A) has Hox genes expressed in all cells of its body
B) has multiple paired appendages along the length of its body
C) has a relatively complex anatomy
D) belongs to one of the first groups to evolve on Earth
C
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Predators often avoid a mimic species because of ____
a. bad taste b. toxic secretion c. resemblance to a well-defended species d. painful sting e. cryptic coloration
Using the data in Figure 53-3, the cause of the decline of the wolf population in 1982 was:a
a sharp decrease in food supply. b. a decrease in the intrinsic rate of increase for the wolf population. c. competition with a newly introduced predator. d. introduction of a disease organism. e. cannot be determined from the data provided.
Evolutionary fitness is measured by
a. physical strength b. reproductive success c. length of life d. resistance to disease e. competitiveness
Researchers applied radioactive phosphorus and radioactive calcium to a freshly cut tree stump. Eight days later, they came back to measure the distribution of the radioisotopes. They found that nineteen different species of shrubs and trees within a seven-meter radius had taken up the radioactive elements. No radioactivity was detected in the air. Radioactively labeled starch was later added to the stump; in subsequent observations, no labeled starch molecules were ever detected in neighboring plants. Which of the following is the most logical explanation for the observation?
a. During transport, the radioactive atoms are removed from the starch molecules. b. Starch molecules are too large to cross cell membranes. c. The radioactivity caused the starch molecules to break down. d. Water in the soil dissolved the starch molecules. e. The radioactive carbon atoms decayed into other atoms that are undetectable.