A certain species of butterfly varies in color from white to dark blue. The birds found in the same area feed on the white or lightly colored butterflies, leaving butterflies that are darkly colored. This is an example of what type of selection?
A. stabilizing selection
B. directional selection
C. disruptive selection
D. artificial selection
Answer: B
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Nucleic acids have a definite polarity, or directionality. Stated another way, one end of the molecule is different from the other end. How are these ends described?
A) One end has a hydroxyl group on the 2 carbon; the other end has a hydrogen atom on the 2 carbon. B) One end contains a nitrogenous base; the other end lacks it. C) One end has an unlinked 3 carbon; the other end has an unlinked 5 carbon. D) One end has one phosphate group; the other end has two phosphate groups.
A nucleic acid contains thymine, allowing you to conclude that:
A. this nucleic acid is DNA. B. this nucleic acid is RNA. C. this nucleic acid could be either DNA or RNA.
In the female, the ________ secretes both estrogen and progesterone, and if fertilization does not occur, this structure degenerates
Fill in the blank(s) with correct word
A treatment that only undergoes two statuses - treated and untreated-is known as this kind of treatment?
A. Biased B. Attenuated C. Random assignment D. Dichotomous