When nitrate is reduced to dinitrogen gas (N2), nitrogen is removed from the ecosystem and returned to the atmosphere through a series of reactions collectively known as ________.
A. nitrogen fixation
B. anammox reaction
C. denitrification
D. All of the choices are correct.
Answer: C
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TCRs are found exclusively on T cells
Indicate whether the statement is true or false.
Why is it not surprising that Staphylococci are the leading cause of wound infections?
A. This genus is readily present as a part of the normal microbiota on most people's skin, so it could easily enter wounds. B. Members of this genus are all particularly virulent and highly capable of causing numerous infections. C. Staphylococci cannot be eradicated from the skin due to multidrug resistance in most members of the genus. Drugs simply don't kill them. D. Staphylococci are capable of a higher degree of spontaneous mutation than most microbes. This makes them able to acquire antibiotic resistance very readily, making them hard to eliminate by pre-surgical antibacterial scrubs. As such, they commonly infect surgical wound sites.
Label the leaf arrangements as opposite, whorled, or alternate. 
A. ________B. ________C. ________
What will be an ideal response?
In building a confidence interval for the ATE of an experiment, what object will determine the spread of the confidence interval?
A. Average outcome for the treated group B. Sample standard deviation for the treated group C. Average outcome for the control group D. Null hypothesis value