Clearly selection pressure will not result in organisms that are better equipped to avoid agents of mass extinction such as the major asteroid impact at the end of the Cretaceous. Yet there is increasing evidence that mass extinctions are selective even though they follow different rules to “background” extinction. What […]

You’re trying to PCR amplify a gene, but your gel shows that there are two bands instead of only one like you expected. You know for certain that there no homologous genes in the genome from which you’re amplifying, so you assume that the issue must be coming from your […]

A student attempts to transform a population of E. coli with a pBluescript plasmid. How do you advise him to identify cells that have the plasmid? Answer Plate the cells on a medium containing X-gal. Cells with plasmids will turn blue. Plate the cells on a medium with ampicillin. Cells […]

Write a summary of the article Results and Analysis of a Survey on Plastic Surgery Would you consider plastic surgery? Do you belive social media advertisements for plastic surgery influence people? What gender most likely to undergo plastic surgery? What is the most popular age when people do plastics surgery? What […]