You expect that a mutation in E. coli that was recently isolated results in loss of enzyme R activity. In looking for the gene, you find comparable sequences. Using an in vitro transcription translation system, you use the gene obtained from the mutant, as well as a wild type E. coli as a control. Following protein isolation and gel electrophoresis, you observe that the wild type E. coli produces

a protein that is 35K in size, corresponding to enzyme R. However, the mutant strain produces a protein that is 25K in size. What does this information suggest?

A) A nonsense mutation has occurred, resulting in a truncated, nonfunctional product in the mutant.
B) A large addition has occurred in the wild type strain, such that approximately 35 tandem repeats of this gene are present and are biologically active.
C) A missense mutation has occurred, resulting in a truncated, nonfunctional product in the mutant.
D) all of the above
E) Not enough information is given.


A) A nonsense mutation has occurred, resulting in a truncated, nonfunctional product in the mutant.

Biology & Microbiology

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A) Archaea. B) Bacteria. C) Eukarya. D) Archaea, Bacteria, and Eukarya.

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The preference of female cichlid fish for brightly colored blue or red males in Lake Victoria provides an example of

____.

a. sympatric speciation b. sexual selection c. allopatric speciation d. reproductive isolation e. ecological speciation

Biology & Microbiology

An atom that has lost electrons is a 

A. cation. B. neutral atom. C. molecule. D. anion.

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A ________ group consists of the most recent common ancestor and all of its descendants.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology