Consider the Hershey-Chase experiment. Is their choice of a bacteriophage unusual? What will be an ideal response?
At first glance, it is very unusual. Viruses are not considered to be alive, so using a non-living entity
to establish that nucleic acids are the genetic material of life is very odd. On the other hand, it was
established that viruses used the host cell genetic machinery to replicate themselves, and thus it could
be safely assumed their genetic material must resemble the hosts.
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Which of the following describes the role of urinary systems in maintaining cellular homeostasis?
A) Urinary systems filter out diseased and damaged cells that can be excreted from the body. B) Urinary systems regulate water balance, pH, and the concentrations of ions in body fluids for cells. C) Urinary systems ensure the delivery of the proper amount of nitrogen to the cells. D) Urinary systems are important for the generation of urea, which cells can use as an energy source when carbohydrates become scarce.
Sarcinae refers to
A. coffee-bean-shaped rods in pairs. B. cocci in pairs. C. groups of endopsores. D. vibrios in threes. E. a cuboidal packet of cells.
Suppose you have a random sample of 21 credit scores from a population of mortgage applicants with a sample mean of 620 and sample standard deviation of 70, and would like to calculate the 99 percent confidence interval of the population mean credit score. Which of the following would be the correct construction?
A. 620 ± 2.58 
B. 620 ± 4 (70), because 4 is the t-distribution critical value.
C. 620 ± 4 
, because 4 is the t-distribution critical value.
D. None of these choices are correct.
In gram-negative bacteria, which secretion systems depend on Sec or Tat to first move proteins across the inner membrane?
a. types II and V b. types I and II c. types II and IV d. types V and VI