USMLE STEP 1 Question of the Day 48

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Subscribe for daily Step 1 questions and more medical education content! • Correct Answer: B. Tyrosine Hydroxyalse • Topic: Biochemistry and Nutrition • Explanation: • Catecholamine synthesis begins with the amino acid tyrosine. The rate-limiting step in this pathway is the conversion of tyrosine to L-DOPA by the enzyme tyrosine hydroxylase. This step is crucial in the regulation of catecholamine production. Subsequent steps include the conversion of L-DOPA to dopamine by aromatic L-amino acid decarboxylase, dopamine to norepinephrine by dopamine β-hydroxylase, and norepinephrine to epinephrine by phenylethanolamine-N-methyltransferase. • Tags: #usmlestudents #usmle #step1 #step1prep #step2 #nbme #usmleprep #usmlepreparation #usmlestep1review #usmlestep #usmleexams #med #meded #medicalschool #medicaleducation #medicalexam #medical #medicalstudent #questionoftheday #qotd #qbank #freestepstudying #viralreels #viralshorts #viralshortvideo

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