Dyes are usually added to sections of biological specimens to increase
(a) resolving power.
(b) magnification.
(c) contrast.
(d) all of the above.
(c) contrast.
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What type of procedure is appropriate to isolate revertants from a population of threonine auxotrophic cells?
A. Grow the auxotrophic cells on and agar plate with threonine; any colonies that form are presumed revertant. B. Grow the auxotrophic cells on an agar plate without threonine; any colonies that form are presumed revertant. C. Threonine auxotrophic revertants could not be isolated on any type of media. D. Grow the auxotrophic cells in broth with threonine; if the broth becomes cloudy, revertants are presumed present.
The release of cyclic AMP as a second
messenger is a response to ____ hormones. a. peptide b. steroid c. protein d. peptide and protein e. peptide, steroid, and protein
Red-green color blindness is an X-linked recessive
trait in humans. What is the probability that a colorblind woman and a man with normal vision will have a color-blind daughter? a. 100% b. 75% c. 50% d. 25% e. 0%
What is the most prevalent form of an allele called?
A) recessive B) dominant C) normal D) neutral E) wild type