Medical University Entrance Examination (Bulgaria) · Organic Chemistry and Biomolecules

Biological Chemistry and Macromolecules

30 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 30 questions

  1. What is the structural relationship between D-glucose and D-galactose?
  2. What type of glycosidic linkage connects the two glucose units in maltose?
  3. Why is sucrose a non-reducing sugar, unlike maltose and lactose?
  4. What is the phenomenon called where the optical rotation of a freshly prepared solution of alpha-D-glucose gradually changes until reaching an equilibrium value (+52.7 degrees)?
  5. Which polysaccharide consists of unbranched chains of D-glucose units linked exclusively by beta-1,4-glycosidic bonds?
  6. Which amino acid among the 20 standard proteinogenic amino acids is achiral (lacks an asymmetric carbon)?
  7. What is the net electrical charge of an amino acid at its isoelectric point (pI)?
  8. Why does a peptide bond possess partial double bond character and restricted rotation?
  9. What type of interaction primarily stabilizes the alpha-helix and beta-pleated sheet secondary structures of proteins?
  10. Which covalent bond links two cysteine residues to stabilize the tertiary and quaternary structures of proteins?
  11. Which nitrogenous bases found in DNA are classified as purines containing a fused double-ring system?
  12. How many hydrogen bonds form between a guanine and a cytosine base pair in the Watson-Crick DNA double helix?
  13. What type of chemical linkage connects adjacent deoxynucleotides along a single strand of DNA?
  14. Which feature distinguishes RNA chemically from DNA?
  15. What is the Michaelis constant (Km) in enzyme kinetics according to the Michaelis-Menten model?
  16. How does a competitive enzyme inhibitor affect the kinetic parameters Km and Vmax in a Lineweaver-Burk plot?
  17. How does a noncompetitive enzyme inhibitor affect the kinetic parameters Km and Vmax?
  18. What is the chemical composition of a triacylglycerol (triglyceride) molecule?
  19. Which fatty acid contains 18 carbon atoms and a single cis-double bond at carbon 9 (18:1 cis-9)?
  20. Why do unsaturated fatty acids with cis double bonds have lower melting points than saturated fatty acids of the same chain length?
  21. What structural feature defines phospholipids as amphipathic molecules essential for membrane bilayers?
  22. Which steroid molecule serves as the biochemical precursor for the synthesis of bile acids, vitamin D, and steroid hormones in humans?
  23. What is the primary product of anaerobic glycolysis in human skeletal muscle during intense exercise?
  24. Which allosteric enzyme catalyzes the committed, rate-limiting step of glycolysis in human cells?
  25. How many net molecules of ATP are generated per molecule of glucose oxidized via anaerobic glycolysis to lactate?
  26. What coenzyme derived from vitamin B3 (niacin) functions as an electron carrier in cellular catabolic oxidation reactions?
  27. What functional group in coenzyme A forms high-energy thioester bonds with acyl groups?
  28. What is the primary metabolic fate of acetyl-CoA in the mitochondrial matrix during energy production?
  29. Which qualitative colorimetric test detects the presence of peptide bonds in proteins using alkaline copper(II) sulfate?
  30. What type of inhibition is demonstrated when an end-product of a biochemical pathway inhibits the enzyme catalyzing the first committed step?

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