Which of the following enzymes, when deficient, has been linked to the masculinization of newborn girls?

A 29-year-old female with PCOS and her husband are having difficulty having a child.  What is typically recommended for women with this condition before medical treatment/medication is used?

A 35-year-old woman complains of diarrhea, belly pain, blood in her stool and fever.   She has just finished a two week course of broad spectrum antibiotics.  Which of the following therapies can be used to treat this woman. 

An oncologist is discussing multiple myeloma. Which information should the oncologist include? Multiple myeloma can be defined as a neoplasm of:

A 40-year-old previously healthy man has the sudden onset of severe right flank pain that comes in waves all night long. When he is seen in the emergency room, after waiting for two hours, he is exhausted. On physical examination there are no abnormal findings. Urinalysis reveals no ketones, glucose, protein, nitrite, or urobilinogen, but blood is present. Urine microscopic examination shows many RBCs but few WBCs. The specific gravity is 1.015 and the pH is 5.5. Which of the following is the most likely diagnosis?

Which of the following develop from lymphoid stem cells?

Following a vehicular accident with blood loss leading to prolonged, severe hypotension, a 30-year-old man is intubated and placed on a mechanical ventilator. He has progressively decreasing oxygen saturations despite increasing his FI02 to 100%. He remains afebrile. He dies 3 days later. At autopsy, the distal lungs show thickened interstitium, and many macrophages and neutrophils. Which of the following would have been observed on X-ray just prior to his death?  

The most likely condition observed in the patient described in the last question is called:  

An epidemiologic study is performed to determine risk factors for development of malignant neoplasms. A statistical analysis of pre-existing medical conditions is done. Some pre-existing conditions are observed to precede development of malignant neoplasms, while others do not. Which of the following conditions is most likely to be statistically unrelated to subsequent malignancy?

A 25-year-old female experiences a headache and takes aspirin for relief. A nurse recalls aspirin relieves the headache by: