Cellular division within the eukaryotic cells requires DNA to condense into the:
A. 30-nm chromatin fiber.
B. 1400-nm chromatin fiber.
C. 300-nm chromatin fiber.
D. 2-nm chromatin fiber.
E. 44-nm chromatin fiber.
B
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The "poles" of a cell are its
a. centrosomes. b. centromeres. c. autosomes. d. centrioles. e. automeres.
Which of these fly organs, as they exist in the description above, best illustrates an exaptation?
A) vestigial halteres B) halteres C) mouthparts D) eggs
Under the ___________ , species are identified based on their unique habitat requirements.
A. phylogenetic species concept B. biological species concept C. evolutionary species concept D. ecological species concept E. general lineage concept
The original source of variation within a population comes from ________
Fill in the blank(s) with correct word