The activity of the enzyme β-galactosidase produced by wild-type cells grown in media supplemented with different carbon sources is measured. in relative units, the levels of activity of βgalactosidase is given for the wild-type. predict the relative levels of β-galactosidase activity in cells grown under the same condition in following mutant cells.

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.

What is the main reason that attitudes are more often revealed in spoken rather than written language? a. in writing, we try to put the "best face" on what we write. b. we speak far more often than we write. c. in writing, we can more easily conceal our attitudes. d. in spoken language, we are often careless in our use of words.

Si units are the modern form of the