Phenotype is an observable change after a mutation has occurred.

  Refer to the image above for the next four questions:

Which virus in the viral scavenger hunt was the most interesting to you, and why?

Which structure confers host range of a bacteriophage?

Which of the three images above depicts transformation?

Which of the following components of PCR ensures amplification of the target DNA sequence only, despite the presence of many other DNA sequences?

The trp repressor is inactive when tryptophan is in low levels in the microbe’s environment

You plate 100 mL of a sample whose dilution is 10-5 that produced 142 colonies. Determine the original cell density of the broth culture.

If an organism grows on mannitol salt agar you can conclude that the microbe is a halophile and that it is a Gram-positive bacterium.  

A clear zone around an antimicrobial disk on a plate being used for a Kirby-Bauer test indicates