Blog

During an Escherichia coli-related outbreak of food poisoning on campus, 16S rRNA sequences were obtained from the stools of several infected students. Phylogenetic comparison of the sequences to those on file at the local health department and at the CDC can be used to do the following:

Why would it be an advantage for a primitive eukaryotic cell to form a mutualistic relationship with a prokaryote capable of aerobic cellular respiration?

Syntrophy is best described as…

A mutant of Rhizobium leguminosarum (a bacterium) is able to survive and reproduce in the laboratory outside of plant roots, but can no longer initiate root nodule formation. What type of genes are most likely mutated in this mutant?

Two tubes are inoculated from the same tube containing a bacterial culture. The cultures are then transferred every day for 2 months. All of the media and growth conditions are the same in every tube. After 2 months of cultivation, the fitness and genotype frequencies of the populations in the two tubes are compared. The fitness of the two cultures is the same, but the genotype frequencies are very different in the two cultures. How is this possible?

You want to know if a specific species of coliform bacteria is present in a water sample from a lake. Which of the following would you use?

What is the most important result of horizontal gene transfer as it relates to human health?

What types of amino acids are found in histones which are most responsible for the binding of DNA?

Every manager (accept, except, expect) him sees the merits of the plan.

(May, Can) I speak to Ms. West, please?