The behavior in which an animal mates for life is
A. monogamy.
B. bigamy.
C. monology.
E. polyploidy.
D. polygamy.
A. monogamy.
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For heart muscles to beat in a coordinated rhythm ions must move from one cell to the next through ____.
A. gap junctions B. hemidesmosomes C. focal adhesions D. adherens junctions E. desmosomes
The only reptiles that have four-chambered hearts, like mammals do, are the ________
a. tuataras b. lizards c. crocodilians d. tortoises
When DNA is cut with a restriction enzyme, the resulting fragments have
A) 5' carboxyls. B) 5' hydroxyls. C) 3' hydroxyls. D) 3' phosphates. E) 3' carboxyls.
Three of the SSU rRNA sequences of three organisms have been compared. For organisms 1 and 2, two of the twelve nucleotides in the sequence are different. For organisms 1 and 3, six of the twelve nucleotides are different. Which organism has greater evolutionary distance from organism 1?
A. Organism 2 B. The evolutionary distance is the same. C. Organism 3 D. Evolutionary distance cannot be predicted from this data.