Low contrast specimens are made easier to see by
A. increasing the amount of light passing through the slide.
B. using dyes that react with their structures.
C. adding color filters to the microscope.
D. using smaller aperture lenses.
E. drying them in a vacuum.
Answer: B
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Although we must be cautious about oversimplifying, when visible traits are markedly different among human races, a likely explanation is that the differences have been favored by:
A. natural selection and/or sexual selection. B. diversifying selection and/or stabilizing selection. C. allopatric speciation and/or sexual selection. D. disruptive selection and/or natural selection. E. sympatric selection and/or sexual selection.
All of the following are included in the Basidiomycetes EXCEPT ________.
A. yeasts B. stolons C. smuts D. puffballs
Imagine a balloon is made from a membrane that's permeable to water but not sucrose molecules. How would the balloon be affected if it is filled with a 50% sucrose solution and then placed in a beaker of water?
A) The balloon would not change in size or volume. B) The balloon would get smaller as it loses water. C) The balloon would get larger as it gains water. D) The balloon would eventually burst.
Which cellular structure is the "shipping center", responsible for packaging materials with the cell?
a) Golgi apparatus b) chloroplasts c) ribosomes d) mitochondria