Phospholipids contain ____________________ tails that are repelled by water. Fill in the blank(s) with the appropriate word(s)
ANSWER: hydrophobic
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A storm blows a small group of migrating birds off course and they land on an island where they remain for 100 generations. At this time a second storm brings more birds from the mainland population to the island. These new birds cannot mate with the established birds even though they are woriginally from the same population. What mechanisms are likely to have been involved in bringing about this speciation? Select all that apply.
_____ Genetic drift _____ Polyploidy in the mainland bird population. _____ Founder effect _____ Adaptation to a new ecological niche
Studies have shown that in the flowering plant Arabidopsis whether or not a root epidermal cell develops a root hair is
determined ____.
a. by the distance of the cell from the root tip b. from the timing of cell division c. by positional information from cells of the root cortex d. shortly after the eight-cell embryo stage e. by the direction of cell division
The releasing site for the hormones of this
figure is indicated by a. A. b. B. c. C. d. D. e. E
Describe how maternal effect genes and segmentation genes work together in the early embryonic
stages of Drosophila. What will be an ideal response?