What does the presence of a bubble in a Durham tube indicate?

Is this bacterial strain positive or negative for mannitol fermentation?

Which of the following biochemical tests can be performed on a well-isolated colony and can provide immediate results without further incubation?

Which of the following organisms is most flexible with regard to its oxygen requirements?

Which of the following bacterial genera are capable of producing endospores? Select all that apply. 

​ *Increased government budget deficits cause crowding out if: 

How much faster does it take for a $10,000 investment to increase to $20,000 if the average annual growth rate is 14% compared to 7%?  

Three Gals Furniture hires ten employees working eight hours each to produce 100 book cases. What is the productivity of these workers?  

If real GDP in a closed economy is $40 billion, consumption is $20 billion, and government purchases are $10 billion, what is investment?

Erie First Furniture hires five employees working eight hours each to produce 80 soccer nets. East Coast Furniture hires ten employees working eight hours each to produce 100 soccer nets. Which company’s workers are more productive?