Which of the following situations would be MOST likely to produce a new species?
A. A group of polyploid individuals arises by an abnormal meioses. The polyploids can only produce viable offspring by mating with each other.
B. Several individuals join an existing population and introduce several new, beneficial alleles.
C. Several individuals colonize a new area and establish a population. Migration between the two populations is common.
D. An existing species becomes subdivided by a glacier and the resulting groups remain physically isolated from each other for thousands of years. When the glacier melts, the two groups are able to interbreed.
E. A volcano erupts and kills all of the frogs on an island, along with many other species. New frogs colonize the island and begin reproducing rapidly because there are no longer any frog predators.
A. A group of polyploid individuals arises by an abnormal meioses. The polyploids can only produce viable offspring by mating with each other.
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The most common bacterial cause of diarrhea that sends people to doctors in the United States is
A) Salmonella. B) Staphylococcus. C) Vibrio. D) Escherichia. E) Campylobacter.
A microbiologist is studying the growth of a particular strain of bacteria to determine when it will transition from exponential growth to stationary phase and from stationary phase to death phase. Which of the following methods of measuring microbial growth would be best for this purpose?
A. Determining dry weight of microbes B. Turbidimetric measurements using a spectrophotometer C. Direct microscopic count D. Viable plate count
Which of the following is true regarding anabolic steroids?
A. Anabolic steroids were first developed by pharmaceutical companies in the late 1800s for the treatment of diseases associated with muscle wasting. B. Anabolic steroids are developed from estrogen, the female sex hormone. C. Because the use of anabolic steroids is illegal without a prescription, the purchase of these compounds has decreased over the past twenty years. D. Anabolic steroids have been found to cause few side effects and do not pose a serious health risk. E. Anabolic steroids increase muscle mass and are thought to help improve athletic performance.
Which of the following might complicate the interpretation of ChIP-Seq data?
A. Because histones can be moved around or ejected from the chromatin, some DNA might not be sequenced if it is not wrapped around a histone B. DNA wrapped around nucleosomes can never be sequenced C. The regions of DNA wrapped around a histone is too long to be sequenced with current technologies D. The DNA between nucleosomes are too compacted to be sequenced