A drug is added to a culture of E. coli cells that inhibit DNA gyrase. Predict the effect of this drug on DNA replication in the affected cells
What will be an ideal response?
Without DNA gyrase to relieve the supercoiling of the DNA induced by DNA helicase, the tension in the closed circle of DNA would cause replication machinery to stall, preventing replication from completing and preventing the cells from dividing.
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The most accurate nucleotide base composition of the DNA double helix is
A. G=A B. T=C C. T+A=C+G D. T+G=A+C E. A=U
Which of the following statements is true?
a. Gene mutations occur independently of each other. b. Gene mutations are relatively rare. c. Ionizing radiation causes chromosomal damage and free radical formation. d. Mutations are random; that is, it is impossible to predict exactly when a specific gene will mutate, but an expected frequency can be assigned. e. All of these are true.
The “A” in AIDS stands for ____
a. adaptive b. active c. acquired d. autoimmune e. artificial
Which of the following is considered a cardinal growth temperature?
A. The optimum temperature B. The minimum temperature C. The maximum temperature D. All of these are considered cardinal growth temperatures.