The "Universal" Genetic Code Is Now Known to Have Exceptions

question 10

Multiple Choice

The "universal" genetic code is now known to have exceptions. Evidence for this can be found if which of the following is true?

• A) If UGA, usually a stop codon, is found to code for an amino acid such as tryptophan (usually coded for by UGG only).
• B) If one stop codon, such as UGA, is found to have a different effect on translation than another stop codon, such as UAA.
• C) If prokaryotic organisms are able to translate a eukaryotic mRNA and produce the same polypeptide.
• D) If several codons are found to translate to the same amino acid, such as serine.
• E) If a single mRNA molecule is found to translate to more than one polypeptide when there are two or more AUG sites.

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Definitions:

Gray Matter

Neural tissue, especially of the brain and spinal cord, that predominantly contains neuronal cell bodies, dendrites, and unmyelinated axons, involved in processing and integration of information.

Upper Limbs

The regions of the human body extending from the shoulders to the hands, including the arms, forearms, and hands.

Pia Mater

The delicate innermost layer of the meninges, the membranes that surround the brain and spinal cord.

Meninges

The three protective membranes that cover the brain and spinal cord.