Predict the phenotype for expression of the E. coli trp operon enzymes for the following mutants: a) A to U mutation at position 48 of the trp operon leader RNA. b) Deletion from positions 114-121 of the trp operon leader RNA. Explain your predictions taking into account the alternate stem-loop structures of the leader RNA.

Of seawater increases with decrease in the temperature. therefore, the cold water sinks to the deeper layers at the bottom

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

High blood pressure occurs when there is too much blood flowing through the blood vessels at one time. by changing the amount of water in the blood, blood pressure can change. the excretory system can to lower blood pressure.which would most likely occur in the kidney? a)more water would be transferred from the nephron.b)less water would be absorbed into the nephron.c)the amount of water in the bladder would decrease.d)the amount of water in the blood would increase.