The nucleus of a eukaryotic cell is characterized by

A) a double membrane. B) a triple-layer membrane.
C) a nonporous membrane. D) a single-layered membrane.


A

Biology & Microbiology

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How are an organism’s life time energy use and economics analogous?

What will be an ideal response?

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Most animals on land have __________ fertilization;

gametes meet in a female’s body.

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Muscle contraction works through the process of sliding two kinds of muscle filaments past each other.

a. true b. false

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Many male songbirds have very distinctive songs that are used to attract females. These songs are an example of a ________ isolating mechanism.

A. postzygotic, mechanical B. postzygotic, ecological C. prezygotic, gamete fusion D. prezygotic, behavioral E. prezygotic, temporal

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