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.
Biology & Microbiology
Muscle contraction works through the process of sliding two kinds of muscle filaments past each other.
a. true b. false
Biology & Microbiology
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
Biology & Microbiology