In vitro transcription assays are performed with radioactive nucleotide triphosphates and the amount of radioacivity incorporated is measured by separating the unincorporated nucleotides from the ones incorporated into rna by counting in a scintillation counter. the results are recorded as counts per minute or cpm. in this experiment a series of different inhibitors are added 10 minutes after the reactions have been started and the transcription reactions allowed to proceed for the indicated times. use the labels to indicate what the expected results would be for the different conditions.

Aresearcher designed an investigation to test what effect eating different types of food would have on blood insulin levels. she selected 10 male subjects who were all 25 years of age and in good health. the experiment took place over 3 days. at 8: 00 a.m. on each day, the subjects ate a meal consisting of only 1 type of food. they had their blood insulin levels measured after consuming the meal. on day 1 they ate a high fat diet, on day 2 they ate a high protein diet, and on day 3 they ate a high sugar diel what is the independent variable in this experiment? a the age of the subjects b the blood insulin level c the type of food consumed d the time of day the meal was consumed