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Showing posts with label Biochemistry Important Questions. Show all posts

Biochemistry First Professional Part II: Important Questions and Topics

Important Questions/Topics from UHS Past Papers of Biochemistry First Professional Part II (Second Year MBBS)

Credits: All medical 2010 batch (Member: Hasaan Shahid)

1) Chemiosmotic Hypothesis.

2) Draw Electron Transport Chain along with its various inhibitors.

3) Enumerate uncouplers of oxidative phosphorylation with their mechanism of action.

4) What is oxidative phosphorylation?

5) Gluconeogenesis - convert pyruvate and glycerol into glucose.

6) Name glycogen storage diseases.

7) Glycogenolysis.

8) Galactosemia.

9) Wernicke-Korsakoff's syndrome.

10) Discuss fate of ammonia? What are its sources?

11) Catabolism of sulphur containing amino acids.

12) Role of homocystein in heart disease.

13) What are the disorders during breakdown of phenylalanine. What is the fate of phenylalanine?

14) Mechanism of fat digestion. How are they transported to system circulation after absorption from GIT?

15) HMP Pathway and in which sites does it occur?

16)  Functions of cholesterol and bile salts.

17) How purines are regulated?

18) Breakdown and synthesis of pyramidines?

19) How uric acid is synthesized from its immediate precursors?

20) Protein synthesis steps.

21) Steps in transcription of RNA molecule.

22) Draw DNA molecule structure.

23) Mechanism of action of insulin in lowering blood glucose level.

24) Enumerate hormones of adrenal gland.

25) Metabolic role of glucocorticoids.

26) Synthesis of thyroid hormones. Describe.

27) Draw and label diagram of replication fork and explain.

28) How DNA is organized into chromosomes?

29) Describe importance of proofreading and DNA repair mechanism.

30) What is mutation? Discuss various types of mutations in sickle cell anemia?

31) Discuss types of mutations with examples.

32) Role of antibiotics in translation.

33) Elaborate various steps of transcription in eukaryotes.

34) Discuss the principle of PCR with its application.

35) Describe Down's syndrome. Discuss its genetic basis.

36)  Name different acids produced in body. Mention their sources.

37) Role of kidney and respiration in maintaining pH.

38) Metabolism of glycine and serine.

39) Enumerate various biochemical reactions of amino acids in the body. Explain any two.

40) Genetic disorders related to pyramidine metabolism.

41) Color blindness.

42) Sickle cell anemia.

43) Enlist hormones of hypophyseal gland.

44) Write down metabolic effects of cortisol, aldosterone and insulin.

45) Gout, its types and related biochemical reactions.

46) Biochemical parameters of diabetic patients.

47) Rate limiting steps of cholesterol metabolism.

48) Class of medication that acts on the rate limiting step of cholesterol metabolism.

49) Enumerate various inhibitors of respiratory chain with their mechanism of action.

50) Synthesis and breakdown of pyrimidine.

51) How is uric acid formed in the body?

52) What is treatment of gout at different stages?

53) Regulation of purine nucleotides. Draw.

54) Salvage pathway of purine synthesis.

55) Irreversible steps of glycolysis.

56) TCA cycle. Point out committed steps.

57) Fatty acid synthase multienzyme complex.

58) Beta oxidation of fatty acids along with energy calculations.

59) Urea cycle, with regulation and importance. Phenylketonuria.

60) Metabolic effects of insulin on carbohydrate, protein and lipid metabolism.

61) Elaborate effects of parathyroid hormone (PTH).

62) Biosynthesis of cholesterol.

63) Von Gierke's disease with causes and features.

64) Bile salts and how are they secreted.

65) Various phases of digestion of lipids and carbohydrates.

66) How GIT mucosa is protected? Give mechanisms.

67) Hormones of GIT. Role of any two.

68) Peptic ulcer. How is it treated?

69) End product of beta-oxidation. How many acetyl Co A molecules are produced during the beta oxidation of palmitic acid?

70) How odd chain fatty acids are oxidized?

71) How ketone bodies are synthesized?

72) Fatty acid synthesis.

73) Tay Sach's disease.

74) Steps of gluconeogenesis.

75) Metabolism of methionine.

76) Maple syrup urine disease.

77) Deamination and decarboxylation in proteins with examples.

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Lipid & Protein Metabolism: Important Questions

Lipid & Protein Metabolism: Important Questions

Q1. (a) What is the role of acetyl CoA carboxylase in fatty acid synthesis? (2)
Q1. (b) Discuss organization of fatty acid synthesis. (2)

Q2. (a) Give four steps for chain lengthening process during fatty acid synthesis. (2)
Q2. (b) What is the fate of free palmitate after its formation? (2)

Q3. Discuss regulation of Cholesterol Biosynthesis in the body. (4)
Q4. How ketone bodies are formed in our body. Discuss diabetic ketoacedosis. (4)

Q5. (a) What is the role of HDL and LDL in heart disease? (2)
Q5. (b) How does insulin regulate lipid metabolism? (2)

Q6. Discuss
(a) Structure, formation, function of chylomicron (2)
(b) Biosynthesis of sphingomyelin (2)

Q7. Write notes on
(a) Trans fatty acids (1)
(b) Slow reacting substance of anaphylaxis (SRS-A) (1)
(c) Essential fatty acids (2)

Q8. Write notes on:
(a) Carnitine shuttle (2)
(b) Fatty liver (1)
(c) Brown adipose tissue (Brown fat) (1)


Ans. *Found in newborn and in hibernating animals.
*Stored amount is relatively less compared to white fat, but it is much more metabolically active.
*Brown adipose tissue contains many mitochondria and cytochromes but have low activity of ATP Synthase. The peculiarity in the mitochondria of brown adipose tissue is that the oxidation and phosphorylation are not coupled, hence it produces more heat and less ATP.
*It is an active center for the metabolism of glucose and fatty acids and is responsible for diet-induced thermogenesis.

Q9. (a) Name and explain the lipo-proteins which are important in the lipid profile of a heart patient. (2)

Ans. LDL, Lp (a) and HDL are all important in the lipid profile of a heart patient.
*Plasma LDL is directly correlated with CHD (coronary heart disease).
*Plasma HDL is inversely correlated with CHD.
* Lp (a) or Lipoprotein (a) is structurally homologous to LDL, except that it contains an addition apoprotein called apo-a. Lp-a inhibits plasminogen, hence decreasing the breakdown of clots. Elevated levels of Lp-a (>30mg/dL) increase the risk of heart attacks.


Q9. (b) How fatty acid oxidation is regulated in fed state and starvation (2)

Q10. Discuss the mechanism of activation of fatty acid for its oxidation. (2)
Q11. Describe the mechanism of hormone sensitive lipase (2)
Q12. Discuss HDL cycle. (2)

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