In Studying an E

question 22

Multiple Choice

In studying an E. coli strain containing a known frameshift mutation, you isolate a mutant in which this frameshift is suppressed. You therefore expect to find which of the following associated with the suppression? (Assume the frameshift has not been corrected in the coding for the peptide.)

• A)suppressor tRNAs encode an amino acid for a stop signal
• B)suppressor tRNAs encode a four- nucleotide anticodon
• C)suppressor tRNAs encode a two- nucleotide anticodon
• D)both B and C
• E)all of the above

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Definitions:

Designed Studies

Research studies carefully planned to investigate specific hypotheses or questions, using systematic methods.

Spontaneous Improvement

A phenomenon where an individual experiences a natural recovery or enhancement in condition or performance without intentional intervention.

Placebo Effect

A phenomenon where a person's condition improves due to their belief in the effectiveness of an inert treatment.

Preexisting Differences

Differences that exist among individuals before an experimental or observational study begins, potentially influencing the study's outcome.