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Most commonly, which vasoconstrictor is added to local anesthetics used in dentistry?

Effectiveness of local anesthetics when injected into infected tissue:

In genetics, the phenomenon in which a single gene affects more than one phenotypic trait is called [__]

Which statement best describes the main distinction between siRNA and miRNA?

Histone Deacetylation relaxes the chromatin, thus increasing transcriptional activity.

How does the foraging gene influence foraging behavior in honeybees (Apis mellifera) and fruit flies (Drosophila melanogaster)?

In Drosophila melanogaster, a gene for eye color is located on the X chromosome. The allele for red eyes (X^R) is dominant over the allele for white eyes (X^r). A female fruit fly with the genotype X^R X^r is crossed with a male with the genotype X^R Y. What proportion of their male offspring would you expect to have white eyes?

The chemical bond that mediates base pairing of DNA is 

What is the primary function of topoisomerase during DNA replication?

The mosaic color pattern of the Calico cats, a condition known as “tortoiseshell” is a result of dosage compensation. Name the genetic mechanism, including the non-coding RNA involved. You may use drawing to illustrate your point.