WBR0887

Author	[[PageAuthor::Rim Halaby, M.D. [1]]]
Exam Type	ExamType::USMLE Step 1
Main Category	MainCategory::Biochemistry
Sub Category	SubCategory::General Principles
Prompt	[[Prompt::A 28 year old woman recently found to have a positive PPD was started on INH prophylaxis. Six months later, the patient returns to the infectious disease clinic with a small wound on the sole of her foot. She claims she does not remember how she got the wound, and explains that she feels like she has been losing feeling in her feet. She reports having difficulty walking and often losing her shoes without even noticing a difference. She also reports feeling tired and extremely irritable recently. Serum levels of which of the following would you expect to be decreased in this patient?]]
Answer A	AnswerA::Methionine
Answer A Explanation	AnswerAExp::
Answer B	AnswerB::Homocysteine
Answer B Explanation	AnswerBExp::
Answer C	AnswerC::Cysteine
Answer C Explanation	AnswerCExp::
Answer D	AnswerD::Succinyl-CoA
Answer D Explanation	AnswerDExp::
Answer E	AnswerE::Methylmalonyl-CoA
Answer E Explanation	AnswerEExp::
Right Answer	RightAnswer::C
Explanation	[[Explanation:: Educational Objective: References: ]]
Approved	Approved::No
Keyword	WBRKeyword::Izoniazid, WBRKeyword::Vitamin B6, WBRKeyword::Pyridoxine
Linked Question	Linked::
Order in Linked Questions	LinkedOrder::