To best isolate mutant bacteria that are threonine auxotrophs from a larger population, threonine-rich media should be inoculated and any colonies that form are presumptive auxotrophic mutants.

Answer the following statement true (T) or false (F)


False

Biology & Microbiology

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Which of the following are produced during the citric acid cycle?

A. ATP, NADH, and FADH2. B. A proton gradient. C. Pyruvate, ATP and NADH. D. ATP and NAD+. E. Oxygen.

Biology & Microbiology

Don’t be alarmed, but you should be aware that right now, there is a species of mites, Demodex folliculorum, living in your eyelashes that are adapted to live on human skin and in human hair follicles, and nowhere else in nature. The good news is that these almost never cause any problems for their human hosts, and most are never even aware that they exist. What type of relationship do your eyelash mites share with you?

a. competitive b. mutualistic c. commensal d. parasitic

Biology & Microbiology

Mucus production that blocks ducts of certain glands and lung passages is a symptom of ____________________. What will be an ideal response?

Biology & Microbiology

The oldest modern human is

A. Homo habilis. B. Homo ergaster. C. Homo rudolfensis. D. Homo heidelbergensis.

Biology & Microbiology