The acid-fast stain is specifically designed for bacteria whose cell walls contain which of the following?
A. Disaccharide-pentapeptide subunits
B. Peptidoglycan
C. Teichoic acids
D. Mycolic acids
Ans: D. Mycolic acids
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The lacP site within the lac operon is upstream of the genes that encode for lactose uptake and metabolism proteins. The lacP site is
A. the lac promoter site. B. where RNA polymerase binds. C. the site where genes are transcribed that encode proteins for metabolizing lactose. D. the lac promoter site where RNA polymerase binds. E. the lac promoter site, where genes are transcribed that encode proteins for metabolizing lactose.
The sheets of red algae used to wrap sushi are actually what stage of the Porphyra life cycle?
a. sporophyte b. zygote c. gametes d. gametophyte
If an agent is transferred from an infected person to another person without an intermediate object, substance or space, it is said to be _____ transmission.
Fill in the blank(s) with the appropriate word(s).
Extremophilic bacteria are able to survive in hostile environments, including scalding hot water as well as springs and vents that reach temperatures over 100°C
Researchers studying these bacteria measured the function of a protein from an extremophile bacterium at 100°C, and they also measured the function of a similar protein from a human cell at 100°C. Which of the following results do you think the researchers obtained? A) The bacterial protein functioned normally, whereas the human protein did not. B) The human protein functioned normally, whereas the bacterial protein did not. C) The bacterial protein and the human protein both functioned normally. D) Neither the human protein nor the bacterial protein functioned normally.