Ureaplasma conserves energy and compensates for an absent electron transport chain by creating chemiosmotic energy gradients and ATP from the breakdown of ________ into ammonia/ammonium.
Fill in the blank(s) with the appropriate word(s).
urea
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Motile bacteria have been placed in an environment with a gradient of a chemical attractant. Which of the following behaviors would you predict?
A. The bacteria will only exhibit runs away from the chemical. B. The bacteria will reduce run duration in the direction of the chemical. C. The bacteria will reduce tumbling frequency. D. Bacteria will randomly switch back and forth between runs and tumbles. E. The bacteria will both reduce tumbling frequency and increase run duration in the direction of the chemical.
The first tetrapods evolved
a. on land. b. after the amphibians. c. in water. d. after the first amniotes. e. from the ray-finned fishes.
The following table presents the effect of different media on the growth response of tryptophan mutations in Salmonella typhimurium (+ = growth, - = no growth)
Medium Supplemented with Strain No Supplement IGP AA IN TRY trp-8 - + + + + trp-2 - + - + + trp-3 - - - + + trp-1 - - - - + (a) Construct the biochemical pathway for the compounds IGP, AA, IN, and TRY based on these data. (b) Place strains of bacteria (mutations) in the appropriate steps in the pathway. (c) In bacteria, it is often possible to make partial diploid strains. Assume that a diploid strain was made containing the complete genomes of the trp-2 and trp-1 strains. Would this diploid strain be able to grow on the unsupplemented medium? Explain your answer.
You look in the microscope and see sister chromatids moving to opposite sides of the cell. You conclude the cell is in
A. prophase. B. telophase. C. interphase. D. metaphase. E. anaphase.