Moderate soil acidity means there are protons in the soil. Protons help nutrient availability by _____.
A. increasing the cation binding to soil particles
B. promoting cation exchange
C. promoting cellular respiration in root cells
D. leaching away the cations from soil after heavy rains
Ans: B. promoting cation exchange
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A patient has a staphylococcal infection of the blood; a septicemia - very serious and possibly deadly. As the doctor, you would like to prescribe a relatively non-toxic and inexpensive drug out of the cephalosporin family. However, if the patient harbors a strain of Staphylococcus that is resistant to a variety of antibiotics, you would prefer to use vancomycin-- which is highly effective against Staphylococcus. Which of the following explains why the cephalosporin drug is preferred for use over the vancomycin?
A. Vancomycin is very toxic, and the Staphylococcus strain could become resistant leaving no back-up drugs with which to treat the infection. B. You really do not know that much about vancomycin, so you would rather go with a drug that you can find out more about. C. You would rather give an inexpensive drug to save the family money. D. Vancomycin is one of the most selectively toxic drugs there is, so you would prefer one that has a more broad-spectrum effect.
How do lymph nodes aid in a cancer diagnosis?
What will be an ideal response?
What does the term theory mean to a scientist?
A) A guess B) A proposed explanation for an observed phenomenon C) A hypothesis that has been supported by the evidence of an experiment D) A broad hypothesis that has been supported by a large number of experiments
Yeast is used to produce beer and wine but can also make bread rise. All of these processes involve the production of alcohol. Explain why you can eat bread and not get drunk
A) The heat of cooking bakes out the alcohol. B) The amount of alcohol produced is too small to be noticeable. C) The bread-making process produces ethyl alcohol, not isopropyl alcohol. D) The bread-making process produces isopropyl alcohol, not ethyl alcohol.