The behavior in which an animal mates for life is

A. monogamy.
B. bigamy.
C. monology.
E. polyploidy.
D. polygamy.


A. monogamy.

Biology & Microbiology

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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

Biology & Microbiology

The only reptiles that have four-chambered hearts, like mammals do, are the ________

a. tuataras b. lizards c. crocodilians d. tortoises

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology