A laboratory recipe lists sucrose, an ammonia compound, calcium salts and a buffer as the ingredients for a microbiologic medium. These are added to water and autoclaved. What type of medium does this protocol produce?
A. defined agar
B. defined broth
C. complex broth
D. reducing agar
E. complex enrichment broth
Answer: B
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The average score on an IQ test, such as the Stanford-Binet, is
A) 50. B) 75. C) 100. D) 150.
You have decided to repeat Palade's experiments on the endomembrane system. You think you've done everything correctly, but when you observe your final sample under the microscope, you find that the entire endomembrane system contains tiny black dots. When you look at later timepoints you see the same thing. What part of the experiment did you forget?
A. You forgot to add radioactive amino acids. B. You forgot to add osmium tetraoxide. C. You forgot to add the silver-containing emulsion. D. You didn't forget anything, this is what the experiment is supposed to look like. E. You forgot to add nonradioactive amino acids.
Which of the following statements is true?
A) Picking which type of media to use depends on how much money you willing to spend. B) Scientists were not able to grow bacteria in the lab until the creation of the Petri dish. C) Picking which type of media format to use depends only on the space available. D) Agar is used as a solidifying agent for bacterial culture. E) Media for bacterial growth only comes in a few varieties.
What would likely result from a mutation in the promoter for lac operon structural genes that increased the number of RNA polymerase molecules that bind to the DNA?
A. lacI protein production would increase. B. Lactose would be metabolized much faster. C. Polycistronic mRNA production would increase. D. Lactose would be metabolized much slower. E. Repression at the lacO site would not be reduced but expression would increase regardless.