Your lab partner has mixed a dead tryptophan + strain of Bacillus subtilis with a live tryptophan– strain and observes that her  Bacillus subtilis culture is now tryptophan +. The most likely explanation for this is __________. Please note that tryptophan + strain can synthesize tryptophan on its own, and therefore does not require it to be supplemented in the growth medium.  This contrasts with a tryptophan–  strain, which cannot synthesize tryptophan due to a mutation and thus needs tryptophan added to its medium to grow.

In which organelles is fMet-tRNA involved in protein synthesis in eukaryotic cells?

While working at a construction site, you cut your hand on an old nail buried in dirt. To avoid infection, you apply H2O2 to the cut. This chemical will be MOST effective against which of the following classes of bacteria?

Which one of the following nucleotide sequences is most likely affected by ultraviolet light?

The following image best illustrates which of the following concepts?  

One type of mutation that can cause a frameshift is __________________ .

The uptake of free DNA from the environment is referred to as ________, while the transfer of DNA with cell-to-cell contact is known as ________.

In the bacterium Enterococcus faecium, choose the proper steps in order of occurrence needed for synthesizing the vancomycin resistance protein. A: Binding of vancomycin to the VanS sensor kinase. B: Stimulation of gene expression from the vancomycin resistance gene by VanR regulatory protein binding to the operator. C: Phosphorylation of the VanR regulatory protein by the VanS sensor kinase. D: Autophosphorylation of the VanS sensor kinase.

Is the following sentence true or false? E. coli is considered naturally competent for transformation, meaning it can readily take up free DNA from its environment.

Which structures are NOT found in prokaryotic cells?