WBR0302: Difference between revisions
Jump to navigation
Jump to search
(Created page with "{{WBRQuestion |QuestionAuthor=William J Gibson |Approved=No }}") |
No edit summary |
||
Line 1: | Line 1: | ||
{{WBRQuestion | {{WBRQuestion | ||
|QuestionAuthor=William J Gibson | |QuestionAuthor=William J Gibson | ||
|Approved= | |ExamType=USMLE Step 1 | ||
|MainCategory=Biochemistry, Genetics | |||
|SubCategory=General Principles | |||
|MainCategory=Biochemistry, Genetics | |||
|SubCategory=General Principles | |||
|MainCategory=Biochemistry, Genetics | |||
|SubCategory=General Principles | |||
|MainCategory=Biochemistry, Genetics | |||
|MainCategory=Biochemistry, Genetics | |||
|SubCategory=General Principles | |||
|MainCategory=Biochemistry, Genetics | |||
|SubCategory=General Principles | |||
|MainCategory=Biochemistry, Genetics | |||
|SubCategory=General Principles | |||
|MainCategory=Biochemistry, Genetics | |||
|SubCategory=General Principles | |||
|MainCategory=Biochemistry, Genetics | |||
|MainCategory=Biochemistry, Genetics | |||
|SubCategory=General Principles | |||
|Prompt=A 3 week old female infant is brought to the emergency room after suffering a seizure. The child was born without abnormalities in an elective cesarean section. The parents report that the child seems lethargic and feeds poorly. The parents noticed the child begin exhibit tremors and jerking movements one hour after feeding. The physician notes that the girl has a strong musty odor and that her skin and hair are particularly light. Which amino acid must the child be supplemented with? | |||
|AnswerA=Arginine | |||
|AnswerAExp='''Incorrect:''' Arginine is a nonessential amino acid. Arginine serves as a precursor for nitric oxide synthesis. | |||
|AnswerB=Cysteine | |||
|AnswerBExp='''Incorrect:''' Cysteine must be supplemented in homocysteinuria. | |||
|AnswerC=Phenylalanine | |||
|AnswerCExp='''Incorrect:''' Phenylalanine supplementation would be disastrous for a patient with phenylketonuria. The deleterious effects of phenylketonuria are caused by the accumulation of phenylalanine to toxic concentrations in the body. | |||
|AnswerD=Tryptophan | |||
|AnswerDExp='''Incorrect:''' Tryptophan is required for the synthesis of niacin (vitamin B3). Tryptophan can be deficient in patients with Hartnup disease, malabsorption syndromes, or carcinoid syndrome (caused by excessive conversion of tryptophan into serotonin). | |||
|AnswerE=Tyrosine | |||
|AnswerEExp='''Correct:''' Tyrosine becomes essential in patients with phenylketonuria. | |||
|RightAnswer=E | |||
|Approved=Yes | |||
}} | }} |
Revision as of 04:39, 4 September 2013
Author | PageAuthor::William J Gibson |
---|---|
Exam Type | ExamType::USMLE Step 1 |
Main Category | MainCategory::Biochemistry, MainCategory::Genetics |
Sub Category | SubCategory::General Principles |
Prompt | [[Prompt::A 3 week old female infant is brought to the emergency room after suffering a seizure. The child was born without abnormalities in an elective cesarean section. The parents report that the child seems lethargic and feeds poorly. The parents noticed the child begin exhibit tremors and jerking movements one hour after feeding. The physician notes that the girl has a strong musty odor and that her skin and hair are particularly light. Which amino acid must the child be supplemented with?]] |
Answer A | AnswerA::Arginine |
Answer A Explanation | AnswerAExp::'''Incorrect:''' Arginine is a nonessential amino acid. Arginine serves as a precursor for nitric oxide synthesis. |
Answer B | AnswerB::Cysteine |
Answer B Explanation | AnswerBExp::'''Incorrect:''' Cysteine must be supplemented in homocysteinuria. |
Answer C | AnswerC::Phenylalanine |
Answer C Explanation | AnswerCExp::'''Incorrect:''' Phenylalanine supplementation would be disastrous for a patient with phenylketonuria. The deleterious effects of phenylketonuria are caused by the accumulation of phenylalanine to toxic concentrations in the body. |
Answer D | AnswerD::Tryptophan |
Answer D Explanation | [[AnswerDExp::Incorrect: Tryptophan is required for the synthesis of niacin (vitamin B3). Tryptophan can be deficient in patients with Hartnup disease, malabsorption syndromes, or carcinoid syndrome (caused by excessive conversion of tryptophan into serotonin).]] |
Answer E | AnswerE::Tyrosine |
Answer E Explanation | AnswerEExp::'''Correct:''' Tyrosine becomes essential in patients with phenylketonuria. |
Right Answer | RightAnswer::E |
Explanation | [[Explanation:: Educational Objective: |
Approved | Approved::Yes |
Keyword | |
Linked Question | Linked:: |
Order in Linked Questions | LinkedOrder:: |