Which of the following best describes the tree of life as currently understood from analysis of DNA sequence data?
a. The tree of life consists of three domains: Bacteria, Archaea, and Eukarya.
b. The base of the tree of life is still uncertain because the molecular clock is not accurate for evolutionary events that occurred that long ago.
c. The tree of life consists of three domains—Bacteria, Archaea, and Eukarya—and there was substantial horizontal gene transfer between different organisms during the early history of life.
d. The domain Archaea is known to be the first branch; domains Bacteria and Eukarya are more closely related to each other.
e. There was substantial horizontal gene transfer between different organisms during the early history of life.
Answer: c. The tree of life consists of three domains—Bacteria, Archaea, and Eukarya—and there was substantial horizontal gene transfer between different organisms during the early history of life.
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A. flow cytometry B. serotyping C. complement fixation D. agglutination
Species divergence due to mating behavior and sexual selection, as has been documented in the Hawaiian crickets, is termed ________. [two words]
Fill in the blank(s) with correct word
Which of the following is NOT true of cytoplasmic determinants?
A. They are asymmetrically distributed across the unfertilized egg B. They are usually mRNAs or proteins C. They originate from the embryonic genome D. They are distributed unequally in different blastomeres as a result of cleavage
When does a C4 plant use rubisco to perform carbon fixation?
a. in daylight only b. from noon to midnight c. from midnight to noon d. in darkness only