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USMLE Questions and Answers (Q&A)

Which of the following most likely caused this patient’s symptoms? A 72-year-old man who receives treatment forcongestive heart failure (CHF) presents to theemergency department with vomiting,...
Chachelly
Answered: Apr 28, 2024
Recent increase in his furosemide dosage

The correct answer is D. This patient presents with symptoms of digoxin toxicity. Severe bradycardia in a patient with complete heart block is a...Read More

1 Answer

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A 21-year-old sexually active college student presents to the clinic complaining of odorous green vaginal discharge and itchiness. Multiple oval flagellated motile organisms are seen on wet mount....
Chachelly
Answered: Apr 28, 2024
Tolbutamide

13. The correct answer is E. The patient consumed alcohol while taking metronidazole for her trichomoniasis. Metronidazole and tolbutamide both have disulfiram-like adverse...Read More

1 Answer

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What is the function of folic acid? A 44-year-old woman presents with extreme fatigue that has worsened over the past two month. She recently overcame her battle against alcoholism, and says her...
Chachelly
Answered: Apr 28, 2024
Transfers one carbon intermediates between biochemical reactions

The correct answer is E. Folic acid plays a key role as a coenzyme for one-carbon transfer as seen in methylation reactions...Read More

1 Answer

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Which is the most appropriate in the treatment of this patient’s symptoms? A 28-year-old woman has a 1-year history of recurrent abdominal pain relieved by defecation. She reports that her...
Chachelly
Answered: Apr 28, 2024
Loperamide

The correct answer is C. This young woman has irritable bowel syndrome (IBS). IBS, a diagnosis of exclusion, is an idiopathic functional disorder characterized by abdominal pain...Read More

1 Answer

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Which laboratory findings would be expected in blood tests in an infant with Crigler–Najjar syndrome? An infant with severe jaundice that is not corrected by phototherapy is in danger of...
Chachelly
Answered: Apr 28, 2024
Increased indirect bilirubin

The correct answer is D. In CriglerNajjar syndrome, the absence of glucuronyl trans ferase results in an inability to conjugate bilirubin, leading to an...Read More

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A woman strikes her head in a car crash and is admitted to the hospital, where she begins urinating up to 1 L every few hours and complaining of constant thirst.Which of the following is the most...
Chachelly
Answered: Apr 28, 2024
Desmopressin

16. The correct answer is B. Desmopressin (dDAVP) is 1-deamino-8-D-arginine vasopressin, an analog of ADH. This woman has central DI caused by trauma to the posterior...Read More

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A patient presents to the emergency department with a crushing injury to her right ankle. A medical student working there is told to evaluate the vascular integrity of the patient’s right...
Chachelly
Answered: Apr 28, 2024
Immediately posterior to the medial malleolus

19. The correct answer is E. Recall that blood supply to the entire leg comes from the femoral artery. The femoral artery runs anteriorly on...Read More

1 Answer

218 views
A 32-year-old female dialysis patient visits her general internist for a health maintenance visit. She subsequently has a dual-energy x-ray absorption examination, which demonstrates significant...
Chachelly
Answered: Apr 28, 2024
Secondary hyperparathyroidism

22. The correct answer is E. Patients with significant renal disease are at particularly high risk for developing skeletal complications, generally known as...Read More

1 Answer

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What can be correctly concluded about this peripheral T lymphocyte? A peripheral T-helper lymphocyte engages peptide-bound class II major histocompatibility complex molecules on the surface of an...
Chachelly
Answered: Apr 28, 2024
The T lymphocyte will undergo anergy

The correct answer is D. This is a phenomenon known as peripheral tolerance. It is an important factor because deletion of self-reactive T lymphocytes...Read More

1 Answer

217 views
A woman with a 2-year-old son comes to her physician because she has been unable to conceive a second child for more than a year. The woman is currently breastfeeding her son.Which of the following...
Chachelly
Answered: Apr 28, 2024
Lactation inhibits secretion of gonadotropin- releasing hormone

14. The correct answer is C. Lactation is maintained by prolactin secretion from the anterior pituitary. Prolactin prevents...Read More

1 Answer

216 views
Which types of fungus are the patient most likely infected with? A 36-year-old man who is HIV-positive presents to the physician with fever, cough, headaches, and myalgias. Questioning reveals...
Chachelly
Answered: Apr 28, 2024
Histoplasma

The correct answer is C. Histoplasmosis does not typically lead to a symptomatic presentation. When symptoms are present, they usually manifest as a flu-like illness with fever,...Read More

1 Answer

213 views
What is an indication of an abnormal grief reaction in this patient? A 47-year-old woman presents to her family practitioner because of depression of 1 month’s duration. Approximately 1.5 years...
Chachelly
Answered: Apr 28, 2024
Delayed grief

The correct answer is A. Pathologic grief includes excessive, intense, or prolonged grief as well as grief that is delayed, inhibited, or denied. The patients quick return to...Read More

1 Answer

212 views
Which change is the following process most likely to affect? Eukaryotic genes can contain thousands of nucleotides that define the sequence. Not all the nucleotides are actually used to code for...
Chachelly
Answered: Apr 28, 2024
Splicing

The correct answer is D. Introns are noncoding regions of RNA that are spliced out of mature mRNA. Almost all introns begin and end with 5 GUAG 3. A mutation in one of those...Read More

1 Answer

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Which is the most likely cause of these findings? A healthy 26-year-old woman delivers a single chorion and placenta but two amniotic sacs following a normal, full-term delivery.This question...
Chachelly
Answered: Apr 28, 2024
Monozygotic twins

The correct answer is D. This woman has had a normal delivery of monozygotic (identical) twins. Monozygotes may also develop separately, producing two amniotic sacs, two...Read More

1 Answer

211 views

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