Describe the following concepts to microscopy.
a. magnification:
b. resolving power:
c. contrast:
a. magnification: the lenses of the compound light microscope project a magnified image of the specimen to a position where the eye lens can focus this image onto the retina. Magnification of this image results in a specimen detail covering a larger proportion of the retina than it would otherwise cover.
b. resolving power: magnification is useful only when adjacent points in a specimen are seen as separate. Magnification without adequate resolving power would be “empty” in that specimen would not be preserved.
c. contrast: contrast is necessary to see a specimen detail against the background of the image. That is, there must be sufficient intensity or color difference, or both, between a detail and the surrounding specimen for the detail to be seen.
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In the above diagram, B represents which of
the following structures?
a. large diameter blood vessels b. capillary beds c. the zone of diffusion of gases and nutrients d. the heart e. capillary beds and the zone of diffusion of gases and nutrients
Describe the ongoing research concerning the relationship between species richness and community
stability. What research supports or fails to support this relationship? What will be an ideal response?
What type of cell produces antibodies?
A. plasma cells B. cytotoxic T cells C. macrophages D. helper T cells