Notice the codon AUG codes for methionine. AUG is a common "start" codon, which indicates the
beginning of a gene. Now look at the codon UGA. This is one of three "stop" codons that indicates the
end of a gene. Once a stop codon is reached, a protein is terminated. What are the other two stop
codons?

UAG and UAA are the other two stop codons.

Explanation:

In a mRNA sequence there are codons which represents the termination of polypeptide chain getting formed. Such triplet sequence which instead of coding for amino acids stops the chain is termed as stop codons.

The start and stop codons decide the length of the polypeptide chain or primary protein transcript or simply the whole protein molecule.

In the genetic code table there are 3 stop codons these are:

UAG

UAA

UGA

Mutation in any of these stop codons would cause the loss of protein function.

Once the stop codon sequence comes the protein synthesis stops.

Chemical senses

Explanation:

Olfaction and gustation are called chemical senses because they have sensory receptors that respond to molecules in the food we eat or in the air we breathe

Olfaction is odor detection, the olfactory receptors are located in the olfactory epithelium, a dime-sized area at the top of each nasal cavity An epithelium is a layer of cells, so the olfactory epithelium is a layer of cells devoted to the sense of smellThe receptors feed directly into a part of the brain called the olfactory bulbGustation is usually called the sense of taste, despite the fact that olfaction dominates our ability to taste foods and liquidsTaste cells are gathered together in taste buds on the tongue, and taste buds are hidden in bumps on the tongue called papillaeOlfaction and gustation are are stimulated by chemicals, the molecules of which interact with receptors to produce a generator potential (olfaction) or receptor potential (gustation)