When the ribosome reaches a nonsense codon, which of the following occurs?
a methionine is incorporated
the polypeptide is released
a peptide bond forms
the a site binds to a charged trna

The correct answer will be option-the polypeptide is released.

Explanation:

The non-sense codons are the codons which do not have any t-RNA thus do not code for any amino acids and leads to the termination of the translation.

The main non-sense codons are UGA, UAA and UAG which when read by the ribosome terminates the process of translation as these codons do not have the t-RNA due to which the ribosome releases the polypeptide from the E-site of the ribosome and terminates the process.

Thus, the option-the polypeptide is released is the correct answer.

answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.