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:

Physical State

The physical state refers to the distinct forms that different phases of matter take on, primarily solid, liquid, and gas.

Reactant

A substance that undergoes chemical changes in a reaction.

Reaction Intermediate

A transient species formed during a chemical reaction that does not appear in the overall reaction equation.

Consumed

Refers to the use or expenditure of a resource, such as energy or materials, especially until it is depleted.