Contrast
a. is the amount that an object's image is enlarged.
b. is the extent to which detail in an image is preserved during the magnifying process.
c. is the degree to which image details stand out against their background.
d. focuses light rays emanating from an object to produce an image.
b
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What structure will help prevent the backflow of blood within the veins?
a. Valves b. Skeletal muscle c. Endothelium d. Smooth muscle e. Basement membrane
The unique feature of HeLa cells that make
them important for research is that a. they are identical to all other human cells. b. they are immortal cells and will grow in culture. c. they are limited in growth cycles. d. they are like stem cells. e. all of these make them important
Enzymes are mostly____, and they function as ____.
Fill in the blank(s) with the appropriate word(s).
In a lichen, the fungal partner ________.
A. provides a substratum within which the alga grows B. protects the alga from excess light intensities C. provides water and minerals to the alga D. All of the choices are correct.