The cities listed below, from Chicago to Pittsburgh, lie in a roughly straight west to east line. Data on temperature, barometric pressure, and sky conditions for each city are shown in the table below. Use the data to explain what types of air masses are present and/or moving among these cities and how this accounts for the weather. What will Pittsburgh’s weather be like within the next 24 to 48 hours? City
Temp (oF)
Pressure (in.)
Conditions
Chicago, IL
73
29.94 rising
Clear
Indianapolis, IN
75
29.93 falling
Partly cloudy
Columbus, OH
78
28.20 falling
Light rain
Pittsburgh, PA
74
29.90 steady
Mostly sunny

How many variables are altered in a good experiment? a.1 b.0 c.2 d.3

The probability of producing a normal child by two parents who are carriers for an autosomal recessive disorder is

Keeping in mind the life cycle of bacteriophages, consider the following problem: during the reproductive cycle of a temperate bacteriophage, the viral dna inserts into the bacterial chromosome where the resultant prophage behaves much like a trojan horse. it can remain quiescent, or it can become lytic and initiate a burst of progeny viruses. several operons maintain the prophage state by interacting with a repressor that keeps the lytic cycle in check. insults (ultraviolet light, for example) to the bacterial cell lead to a partial breakdown of the repressor, which in turn causes the production of enzymes involved in the lytic cycle. as stated in this simple form, would you consider this system of regulation to be operating under positive or negative control?