The thermal death time for E. coli at 63°C was determined to be 20 minutes. Predict the affect on thermal death time if the temperature is increased to 67°C.
A. The thermal death time will be longer.
B. There will be no change in thermal death time.
C. The thermal death time will be shorter.
D. There is not enough information to make this prediction.
Answer: C
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Luria and Delbruck grew many liquid cultures of bacteria then spread a small sample of each culture on nutrient agar infused with bacteriophage in separate petri plates. They assayed the number of bacterial colonies that formed on each plate. What did the appearance of a bacterial colony on a petri plate indicate?
A) The bacterial colony was derived from one initial cell that was resistant to infection by the bacteriophage. B) The bacterial colony was made up of many cells that became resistant to bacteriophage infection independently. C) A colony formed when a bacterial cell was not resistant to bacteriophage infection. D) The bacterial cells that made up a colony were resistant to antibiotic.
The process of bringing in the appropriate amino acid into position along the mRNA in the cytoplasm is
A. transduction. B. translation. C. transcription. D. translocation.
The field of immunology studies the immune response to various factors. What is the name of an inappropriate immune response?
A) sneezing B) autoimmunity C) fever D) infection
Which of the following statements about the unfolded protein response (UPR) is false?
(a) Activation of the UPR results in the production of more ER membrane. (b) Activation of the UPR results in the production of more chaperone proteins. (c) Activation of the UPR occurs when receptors in the cytoplasm sense misfolded proteins. (d) Activation of the UPR results in the cytoplasmic activation of gene regulatory proteins.