Synchronous hermaphroditism is when an animal changes from one sex to another
Indicate whether the statement is true or false
false
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A variety of E. coli clones have been isolated, and the DNA has been extracted, digested with restriction enzymes, denatured, separated by gel electrophoresis, and transferred to nylon membrane by the Southern blot procedure. A radioactive probe is used that hybridizes with a gene of interest. The DNA corresponding to a single clone yields a single DNA band after probing the blot. Based on this
information only, A) all of the clones tested, except the one described, have the gene of interest. B) only the one clone described has the gene of interest. C) the gene of interest is located entirely on the DNA band visualized. D) the part of the gene recognized by the probe is located on the DNA band visualized. E) both choices B and D
A population that has experienced a genetic bottleneck and lost its genetic variability can never again attain substantial numbers.
a. true b. false
Which of the following enzymes allows retroviruses to transcribe DNA from ssRNA?
A. protease B. DNA polymerase C. integrase D. reverse transcriptase E. nuclease
During a hot afternoon in August, Sara hosted a baby shower for her best friend. Other friends brought much of the food, including a cold cut platter and potato and macaroni salads. They set the food items out on the picnic table in the shade, and then chatted and enjoyed watching their friend open her gifts. It was close to two hours later before they had their meal. Later that evening, eight of the guests who had attended the shower began to feel nauseated and began to vomit severely. The vomiting lasted most of the night, but as morning came, it diminished and they began to recover. What is the most likely cause of the illness?
A. Infection with Salmonella enteritidis B. Botulism C. Infection with E. coli O15:H7 D. Infection with Shigella sp. E. Staphylococcal food intoxication