Urea is _____
A) insoluble in water
B) more toxic to human cells than ammonia
C) the primary nitrogenous waste product of humans
D) the primary nitrogenous waste product of most birds
E) the primary nitrogenous waste product of most aquatic invertebrates
Answer: C
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Carrier molecules are utilized for ____
a. active transport only b. passive transport only c. both active and passive transport d. osmosis e. transport of all types of molecules
The transport of xylem sap is the most rapid movement of any material in plants. Indicate whether the statement is true or false
Why can't the regression coefficients in correlation analysis be interpreted as the causal effect of a treatment on the outcome?
A. Regression coefficients in correlation analysis cannot be consistent. B. Co-movement/correlation amongst two variables could be generated by their relationship to other variables. C. Regression coefficients in correlation analysis cannot be unbiased. D. You cannot conduct hypothesis tests on coefficients in correlation analysis.
Which of the following species was once considered so benign that microbiologists used it to trace movements of air currents in hospitals and over cities?
A. Morganella B. Providencia C. Citrobacter D. Serratia E. Legionella