Why is there great phylogenetic diversity among phototrophic eukaryotes?
a. Their ancestor diverged early, allowing descendants more time to evolve apart.
b. Secondary endosymbiosis occurred several times.
c. Several kinds of cyanobacteria were engulfed.
d. Both a and b are correct.
Answer: B
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Copies of recombinant DNA are produced in a genetically engineered organism by ____
a. reverse transcriptase b. exonucleases c. restriction endonucleases d. DNA ligase e. DNA polymerase
At high tide a coastal plant or animal cell will be in
Estuaries are locations where rivers flow into oceans, with tidal shifts changing the salt concentrations. Plants and animals that live in estuaries face a dilemma in maintaining water balance inside their cells. During high tide they are in salt water, while at low tide they are in fresh water. A. osmosis. B. an isotonic solution. C. a hypotonic solution. D. a hypertonic solution. E. equilibrium.
The fossil record resembles the living species in the same geographic area. How does this pattern support the theory of evolution by natural selection?
A. It is evidence that Lamarck was right: Species become more complex over time. B. It is evidence of the law of succession. C. It is evidence of Aristotle's great chain of being. D. It is evidence that species can change over time.
Echinoderm larvae are ________________, while echinoderm adults are ________________.
a. radially symmetrical; bilaterally symmetrical b. bilaterally symmetrical; radially symmetrical c. aquatic; terrestrial d. segmented; unsegmented e. gastropods; bivalves