Scientists are studying compounds in a newly discovered rainforest plant. The plant produces an unusual substance that local people say acts as an anesthetic. If another scientist tests the substance using iodine, the scientist testing for carbohydrates.
The existence of carbohydrates in leaves can be sampled by the Iodine test. When chlorophyll is removed from the leaf by boiling it in alcohol and then placing two drops of iodine solution it turns blue in color which indicates the presence of starch.
The iodine test is a test that is utilized to test for the existence of starch. The mixture of starch and iodine produces an extremely blue-black color.
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Explanation:
In acid – base chemistry, salts are ionic compounds that result from the neutralization reaction of an acid and a base. Basic salts contain the conjugate base of a weak acid, so when they dissolve in water, they react with water to yield a solution with pH greater than 7.0.
 
        
                    
             
        
        
        
Oncogenes result from turning on, or activating proto oncogenes. Proto oncogenes are genes that code for positive cell cycle regulators, so proto oncogenes code for proteins that turn on cell division. Proto oncogenes are normal genes, but when they are mutated, they become oncogenes.  Oncogenes are expressed too much, which makes them  turn on cell division too much, which is cancer. 
        
             
        
        
        
C. Medusa. Everything else on the list is a part of another creature, medusa is the only cnidarian here!