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BCH 301David Umahi Federal University of Health SciencesOct 27, 2026

BCH 301 - BIOSYNTHESIS OF AAs

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Executive Topic Summary

High-yield cheatsheet and core concepts for BCH 301.

High-Yield Exam Takeaways

  • BCH 301: Amino Acid Biosynthesis II
  • Phosphoglycerate Family: 3-PG → Serine → Glycine/Cysteine
  • PEP/Erythrose-4-Phosphate Family: Aromatic Amino Acids
  • Ribose-5-Phosphate Family: Histidine
  • Critical Integration Points

Sample Practice Questions (Active Recall)

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Q1.Which of the following best explains why amino acid biosynthetic pathways are classified according to precursor families?

AThe classification organizes pathways by nitrogen donor requirements, grouping all glutamate-dependent syntheses together.
BThe classification separates essential from non-essential amino acids based on human synthetic capability.
CThe classification indicates which central metabolic intermediates supply carbon skeletons, predicting pathway connections and metabolic regulation.
DThe classification reflects the evolutionary origin of enzymes from common ancestral genes across all kingdoms.

Q2.What is the consequence of defective phosphoglycerate dehydrogenase on serine availability and neurological development?

ASerine synthesis shifts to mitochondrial pathways, preserving normal brain development without clinical consequences.
BSerine deficiency is compensated by dietary glycine conversion, preventing any developmental impairment.
CSerine becomes limiting, impairing protein synthesis, one-carbon metabolism, and membrane lipid production essential for neurological function.
DSerine accumulates excessively, causing neurotoxicity through excitotoxic mechanisms at NMDA receptors.

Q3.Cells obtain nitrogen for amino acid biosynthesis commonly through ______, ______, or other nitrogen-donor reactions.

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