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. directional selection
B. stabilizing selection
C. disruptive selection
D. artificial selection
Answer: A
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Which of the following is an example of evolution that can be observed and studied?
A. resistance of HIV to drug treatment B. resistance of weeds to select herbicides C. bacterial resistance to antibiotics D. All are examples of evolution that can be observed and studied.
We use energy in many ways. What is one thing we cannot do to energy?
A) Destroy it. B) Waste it. C) Convert it. D) Store it.
The plasma membrane functions as a
a. selective barrier to the passage of molecules. b. site for the uptake of macromolecules into the cell. c. site for cell-cell interactions. d. All of the above
In most vertebrates the spinal cord is dorsal to the gut
a. true b. false