What is the missing reactant for the following reaction?

Refer to image UA 42-year-old man complained of sightly scaly, hypopigmented macules on his upper trunk that continued for 3 months. He reports that even when he works in the sun without a shirt, the hypopigmented areas will not tan. A KOH prep reveals hyphae and yellow fluorescence is noted when examining with the Wood’s lamp. Which of the following is the most likely etiology?Refer to image U

Perioral dermatitis can be exacerbated or made worse by which of the following?

Which choice BEST describes the functional groups in adrenaline below, a neurotransmitter. 

Refer to image VThis patient has chronic dry and greasy scale on the scalp, ears and eyebrows. The scale on her scalp causes dandruff. Treatment so far has focused on anti-inflammatory and regulation of the stratum corneum. What treatment segment has been missing?Refer to image V

Below are several different molecules. Which ones contain a ketone?

Refer to image BThis 28-year-old woman presents with chronic, painful nodules and abscesses in both of her axilla. She reports a past history of severe acne. You prescribe minocycline for a 3-month course. What other oral medications could be prescribed in addition to the antibiotic?Refer to image B

See figure MThis homeless patient presents with a small, deep “punched out” crusted ulcer on her leg. She says it has been there for a couple of months, but getting worse. This is her first lesion of this type. You order a bacterial culture and the results come back positive for Staphylococcus aureus. Your diagnosis and treatment are:See figure M

Which of the following developmental disturbances DOES NOT occur during the cap stage of tooth development?

The structure at the tapered end of the ameloblast that faces the basement membrane that will become the dentinoenamel junction is called the: