In an E. coli conjugation experiment, the donor cell is found to be thr+, leu+, his+, and the F– cell is thr–, leu–, and his–

When the mating is interrupted after 10 minutes and the recipients are plated, they are found to be leu+ and his+ but thr–. What can you conclude?


Leu and his are close together.

Biology & Microbiology

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Explain why the discovery of iron-oxidizing phototrophs has important implications for both understanding the evolution of photosynthesis and explaining the large deposits of ferric iron (Fe3+) found in ancient sediments on Earth

What will be an ideal response?

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When species of a single large population slowly evolves over generations into a new species, this an example of

A. adogenesis. B. cladogenesis. C. anagenesis. D. monospeciation. E. punctuated equilibrium.

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Which of the following is TRUE concerning the C4

pathway? a. It produces large amounts of carbohydrates. b. It feeds into the C3 pathway. c. It is the mechanism of photorespiration. d. It involves the activity of rubisco. e. All of these are true.

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Which organs are often analyzed for cancer cells to determine whether the tumor has metastasized?

A) liver B) lymph node C) pancreas D) ovary

Biology & Microbiology