The enzyme reverse transcriptase
A) synthesizes DNA from a DNA template of the same polarity.
B) synthesizes DNA from an RNA template.
C) synthesizes RNA from an RNA template.
D) synthesizes RNA from a DNA template.
E) can synthesize DNA or RNA from an RNA template.
B
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A dihybrid cross of two contrasting pure-breeding
organisms a. produces homozygous offspring. b. must produce a phenotype different from either pure-breeding parent. c. results in the disappearance of the recessive traits in the first generation. d. takes place only in the laboratory under precisely controlled conditions. e. will result in the immediate formation of another pure-breeding variety.
Sympatric speciation is the most common method of speciation and accounts for almost all evolution
of new animal species. Indicate whether the statement is true or false.
Which molecule is a "metabolic taxicab" that shuttles electrons?
A) OAA B) NADH C) ATP D) ADP
Which of the following groups has been planted extensively along U.S. streets because of their resistance to pollution?
A) Bryophytes B) Liverworts C) Cycads D) Ginkgos E) Conifers