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Mycobacterium tuberculosis is an obligate aerobe. In which organ would you expect to find these bacteria?

Soybeans will have several hundred Rhizobium nodules per plant and may divert 20–30 percent of their energy generated by photosynthesis to the nodules instead of other plant functions. Why would the plant divert so much energy to Rhizobium?

Cells that produce fine fibers of collagen in cartilage are osteocytes.

If you wanted to genetically engineer a goat so that it had finer muscle control than other goats, what would be your goal?

Scientists measured the pressure in the xylem of redwood trees at different heights and found that the higher they made their measurements, the lower the pressure. They extrapolated this to a pressure of zero, and concluded that the tallest a tree could grow is 122–130 meters. The tallest known tree on Earth is 112.7 meters. What assumption were the scientists making to conclude that when pressure was zero, the plant could grow no further?

What type of feedback is exemplified by the formation of a blood clot that results in the rise of blood pressure?

Botox is a toxin produced by the bacterium Clostridium botulinum. When ingested with tainted food, botox can cause distress by paralyzing the intestines, and, in high doses, can kill by paralyzing muscles needed for breathing and heartbeating. Why would botox be an adaptation for Clostridium botulinum?

Chemicals that are vital to the metabolism, growth, and reproduction of plants are called essential elements.

Soil scientists use relative amounts of sand, silt, and clay to classify soils.

Which of the following is not a characteristic of nematodes?