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. Physiological ecology
B. Ecosystem ecology
C. Organismal ecology
D. Community ecology
E. Population ecology
D. Community ecology
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One of the important reasons for maintaining biodiversity is to
A. prevent increased disease spread due to edge effects. B. prevent introduction of invasive species. C. prevent loss of habitats that can be logged or farmed at some future date. D. prevent loss of habitat leading to edge effects. E. maintain the genetic diversity of wild relatives of common crops.
What does it mean when we say a vaccine is based on an "attenuated" virus?
A) The vaccine isn't the virus at all, just similar-shaped chemicals. B) The vaccine is based on a virus that has been rendered harmless by lab-induced mutation. C) The vaccine is a similar species to the virus that isn't harmful (e.g., cowpox for smallpox). D) The vaccine is a live virus that has been heat-killed. E) The vaccine is a live virus that has been chemically damaged.
On which surface of an epithelial cell are microvilli located?
Which of the following is not true of the gram’s staining procedure?
A) It works for all bacteria B) The stain used is crystal violet C) It differentiates between gram-positive and gram-negative bacteria D) Some bacteria lose the stain by decolorization E) An iodine solution is used