Ascientist puts nucleotide chains of in a test tube under conditions allowing protein synthesis. soon the test tube is full of polypeptide chains composed only one the amino acid phenylalanine. what does this experiment indicate?

That UUU is triplet codon for the  amino acid phenylalanine

Explanation:

The genetic code is the set of rules used by cells to translate information from the genetic material into proteins.  This occurs during the process of translation in which the ribosome  links amino acids in an order specified by  mRNA, using  tRNA as a mediator. Three nucleotides in the mRNA that are read at a time are called codons. One codon specify one amino acid, but one amino acid can correspond to more then one codon.

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

it has to be understood that the sea water contains a huge amount of sodium and chlorine ions and if they enter the cell of the atlantic cod fish, the cell will shrivel and the fish will die. to avoid such a condition, the fish uses active transport for the purpose of removing the ions against the gradient.

explanation:

the atlantic cod is not a maritime osmoconformer. its native application of salts is less than that of the seawater it lives in. it is continually falling water from the gills to the ocean via osmosis.

countering that, the fish is going to be swallowing seawater. but since its internal collection of salts is lower than seawater, the fish will want to go free of excess salt, and since that's going upon a gradient, then active transport, requiring energy, must be used to pump out the salt. much marine fish use the organs to filter out the salt and these fish discharge very straight urine.