Infections with Legionella pneumophila are usually transmitted via aerosols from contaminated air conditioning systems, showers, and humidifiers
Indicate whether the statement is true or false
TRUE
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An experiment was done to determine the decimal reduction time of a specific population of organisms at 80oC. The data is indicated by an arrow on the graph. Which labeled line represents the likely results if the experiment was repeated using a lower temperature?
A. Line C B. Line A C. Line B D. Line D
How are RNA hairpin turns related to termination in E. coli?
A) The turns are formed from complementary base pairing and cause separation of the RNA transcript and RNA polymerase. B) A three-base repeat signals a stop sequence, and the RNA transcript is released. C) Release factors bind to sites on the hairpin turn, causing release of the RNA transcript. D) The hairpin turn prevents more nucleoside triphosphates from entering the active site of the enzymes, effectively shutting off the process of polymerization.
When cichlids were present, what was the main selection factor affecting the average number of spots on male guppies?
a. natural selection for a reduction in spot number in order to avoid predation b. natural selection for an increase in spot number to enhance camouflage ability c. natural selection for a reduction in spot number to enhance attractiveness tofemales d. natural selection for an increase in spot number to enhance attractiveness tofemales
What is a cladogram?
a. A diagram of radioactivity b. A diagram showing lines of descent c. A demonstration of genetic variability d. A geographical distribution of organisms e. A similar structure found in different organisms