The most important concept in the field of population genetics is
A. genetic variation.
B. natural selection.
C. rates of mutation.
D. phenotypic variation.
E. population size.
Answer: A
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A scientist is studying several areas along an elevation gradient. Her study involves prescribed burns (purposefully set, low-intensity fires) in the different areas, followed by a comparison of the type and abundance of organisms that colonize them over the next ten years. What scale best describes her study?
A. Ecosystem ecology B. Population ecology C. Physiological ecology D. Community ecology E. Organismal ecology
Which plants keep their stomata open only at night?
A. CAM B. C3 C. C4 D. No plants keep their stomata open only at night E. All plants do.
In the Gram stain, if the decolorizing step is deleted, gram- cells would appear ________ at the completion of the staining procedure.
A. Pink B. Blue C. Unstained D. Purple
While many prokaryotic cells have a single membrane bilayer, all eukaryotic cells have a complex system of internal membrane-bound compartments. How might it be advantageous for the cell to have these additional compartments?
What will be an ideal response?