The compressor on a vehicle has seized. Besides the new compressor, what other component should also be replaced?

The owner of a car complains of a whistle or hiss only after the engine is shut down and only when the air-conditioning has been running. Technician A says there is a broken or leaking vacuum hose inside the dash. Technician B says this is a normal noise caused by the pressure of the refrigerant equalizing after the engine is turned off. Who is correct?

The drawing below represents an organism that a student observed when examining a sample of pond water with a light microscope.  The student identified this organism as a prokaryote.  Is the student correct?  Provide 3 pieces of evidence to support your answer. eukaryote.jpg

The graph at the left in figure 5.7 shows the reaction rate for an enzyme at its optimum temperature.  Which graph shows enzyme activity at two degrees higher temperature? reaction rate.jpg

The appearance of Gram-negative bacteria after completing the Gram stain is 

Which of the following uses glucose for carbon and energy? 

The appearance of Gram-positive bacteria after adding the counterstain in the Gram-stain is

Which microscope achieves the highest magnification and greatest resolution? 

DNA replication.jpg In the figure above, what is base 2 attached to?

Assume you are working for a chemical company and are responsible for growing a yeast culture that produces ethanol.  The yeasts are growing well on the maltose medium but are not producing alcohol.  What is the most likely explanation?