In the figure 6 to the right, the competitor arrives in 1982. The finch population responds to drought in the presence of a competitor by
A) evolving to have smaller beaks
B) adapting to have larger beaks
C) character displacement
D) A or B
E) A and C
Answer: E) A and C
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In the lower leg, the gastrocnemius muscle bends the foot away from the knee, as in pointing one's toes. The tibialis anterior muscle flexes the foot toward the knee. These two muscles are
A) synergistic. B) homeostatic. C) mutualistic. D) antagonistic. E) cooperative.
The total DNA content of each daughter cell is reduced during meiosis because
a. chromosomes do not replicate during the interphase preceding meiosis I. b. chromosomes do not replicate between meiosis I and II. c. half of the chromosomes from each gamete are lost during fertilization. d. sister chromatids separate during anaphase of meiosis I. e. chromosome arms are lost during crossing over.
Which process converts one parental double-stranded DNA molecule to two identical offspring molecules?
A. transformation B. transcription C. replication D. translation
Communities with a high level of bacterial diversity are found in many habitats including soil and aquatic environments. Recent studies indicate this diversity is crucial to the functioning of these communities. The same studies have also found that phage abundance plays a critical role in the maintenance of the bacterial diversity within these communities. Are phages a density-dependent or a density-independent regulating factor?
A. Density-dependent B. Density-independent