Body parts that are similar in different lineages because the lineages have a common ancestor are ____
a. homologous structures
b. comparative structures
c. analogous structures
d. repetitive structures
e. vestigial structures
ANSWER: a
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Which of the following is the strongest evidence that cytokinins regulate cell divisions? There is _____
A) an increase of cyclin gene expression in tissues exposed to cytokinin B) a decrease of cyclin gene expression in tissues exposed to cytokinin C) an induction of shoot growths in tissues exposed to cytokinin D) an induction of root growths in tissues exposed to cytokinin E) an ability of cytokinin to interact with auxin at the molecular level and change auxin biosynthesis and transport
Over ____% of the U.S. population lives within 50 miles of a coastline
a. 10 b. 25 c. 40 d. 50 e. 70
Each species occupies a certain
__________characterized by physical and chemical features and by the array of other species living in it. Fill in the blank(s) with the appropriate word(s).
Which of the following enzymes does HIV use to synthesize DNA on an RNA template?
A) DNA ligase B) RNA polymerase C) reverse transcriptase D) DNA polymerase