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  Sometimes, chemical damage to DNA can occur just before DNA replication begins, not giving the repair system enough time to correct the error before the DNA is duplicated. This gives rise to mutation. If the cytosine in the sequence TCAT is deaminated and not repaired, which of the following is the point mutation you would observe after this segment has undergone two rounds of DNA replication?  

MSA plates use ______ to select for species of Staphylococcus.

(select all that apply) Which of the following are considered combination reactions?

After serial dilutions of have been plated and incubated for growth, each colony on the plate represents:

Which scenario would generate false positives in a PCR test designed to detect SARS-Co-V2?  

  The deamination of cytosine generates a uracil base. This is a naturally occurring nucleic acid base, and so does not represent a DNA lesion caused by damage due to chemicals or irradiation. Why is this base recognized as “foreign,” and why is it important for cells to have a mechanism to recognize and remove uracil when it is found in the DNA duplex?  

A 26 year old presents to the urgent care clinic with complaints of sores on upper lip. They describe them as starting with tingling and burning sensation prior to the eruption. The vital signs are stable, afebrile and remaining physical examination negative, except for left, upper lip vesicle lesion surrounded by an erythematous base. What diagnosis does APP provide to the patient?

  The TATA box is  

  DNA replication is considered semiconservative because  

  What functional group is found at the 5’ end of a DNA strand?