You are given two samples of DNA, one from Clostridium perfringens and the other from Mycobacterium tuberculosis. Unfortunately, the labels on the tubes of DNA were accidentally removed, and you do not know which DNA sample belongs to which organism
As you were doing some work with Escherichia coli in the lab, you also have some of its DNA available as well. The %G + %C values for each of the organisms is known (C. perfringens, 27%; M. tuberculosis, 67%; E. coli, 50%). Based upon this information, how could you quickly determine the source of the DNA for your two samples?
What will be an ideal response?
Answer: The thermal denaturation of each DNA sample could be examined. The C. perfringens DNA would melt at a lower temperature than the E. coli DNA, and the M. tuberculosis DNA would melt at a much higher temperature. (Individual instructors may wish to have students draw a sample graph as part of their answer to this question.)
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You awaken to find yourself lying on the bare ground, dirty and injured. In the dim light, you can make out wreckage around you and surmise that you have survived a plane crash. Over the next few days, you wander the hot, humid area and find an amazing number of different plant and insect species. You are able to trap and eat several rodent size mammals, but do not see any larger mammals. Into what biome did your plane crash?
A. Tropical grassland B. Taiga C. Temperate rain forest D. High desert E. Tropical rain forest
Red algae can only live in deep waters because their photosynthetic pigments are adapted only for these depths
Indicate whether the statement is true or false
What molecule is the common entry point to aerobic respiration for carbohydrates, proteins and fats?
What will be an ideal response?
Secondary succession occurs
a. after a fire. b. on a new volcanic island. c. on bare rock. d. on land exposed as a glacier retreats e. none of these answers