A microbiologist makes a fixed smear of bacterial cells and stains it with methylene blue. All cells appear blue under the oil immersion lens. This is an example of ________.
A. capsule staining
B. the acid-fast stain
C. simple staining
D. using an acidic dye
E. negative staining
Answer: C
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If the frequency of allele A is .7, using the Hardy-Weinberg formula, what would the frequency of the heterozygous Aa genotype be?
A. .09 B. .3 C. .42 D. .49 E. It cannot be calculated from the information provided.
Other than replication, transcription, and DNA repair, what other activities of the cell are affected by supercoiling?
What will be an ideal response?
Which one of the following methods of antimicrobial susceptibility testing is the most popular method in the United States? (Note: information about susceptibility testing can be found on the CD-ROM that accompanies this book.)
A) agar dilution method B) disk-diffusion method C) macro broth dilution method D) micro broth dilution method
In the peacock butterfly experiment, what was
the conclusion?
a. predatory birds are not deterred from eating peacock butterflies with spots b. predatory birds are deterred by peacock butterfly clicking sounds c. peacock butterflies with spots mated more often than those without spots d. predatory birds are deterred by the dark color of the peacock butterfly e. peacock butterflies that made clicking sounds attracted more predatory birds