4. In a clinical trial with an active control, what is the experimental treatment being compared to?
A. A medicine with known effect in the disease being studied
B. Nothing
C. A placebo
D. An experimental treatment for the disease being studied

C

Explanation:

“Active control” (or “Active Comparator”) means that a known, effective treatment (as opposed to a placebo) is compared to an experimental treatment.

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

regents of the university of california v. bakke, 438 u.s. 265 (1978), was a landmark decision by the supreme court of the united states. it upheld affirmative action, allowing race to be one of several factors in college admission policy.