0819E373
First Year MBBS Examination
I MBBS Biochemistry Paper 1
Time: 3 hours
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Max Marks: 501. Answer to the points.
2. Figure to the right indicates marks.
3. Use separate answer books for
each section.
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4. Draw diagrams wherevernecessary.
5. Write legibly.
Section 1
1. Write short notes on the following
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a) Diabetic ketoacidosis(10)
b) Von Gierk's disease
c) Biochemical basis of ammonia
toxicity
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2. Write Short notes of (any three)a) Physiologically important
(9)
glycosides
b) Serum enzymes in myocardial
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infarctionc) Regulation of cholesterol synthesis
d) Acute intermittent porphyria
e) Suicidal inhibition of enzymes
3. Discuss Any TWO
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a) Application of ELISA (enzyme(6)
linked immunosorbent assay)
b) Role of kidneys in regulation of
blood pH
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c) Fluid mosaic model of cell
membrane
Section 2
4. Write Short notes on (any two)
a) Reciprocal regulation of
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(10)glycogenesis of glycogenolysis
b) Fatty acid synthase complex
c) Significance of HMP (hexoe mono
phosphate) shunt
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5. Write Short notes on (any two)a) Water pollutants
(9)
b) Oncogenes
c) Uncouplers of oxidative
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phosphorylationd) Structure of immunoglobulin
e) Biological effects of radiation on
tissues
6. Case report:
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During a hunger strike, one tudent(6)
who took only water for next 15 days
when his condition deteriorated, he was
admitted in a hospital blood level of
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sugar and amino acids were found tobe decreased urine had ketone bodies,
urinary non protein nitrogen was
increased. Answer the following
questions (any six).
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1) The brain consumes 65 % of thetotal circulating glucose daily. How
does brain obtain energy during
starvation?
2) Can brain utilize ketone bodies to
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meet part of its energy requirement?3) How does starvation trigger
gluconeogenesis and lipolysis?
4) What is the fate of amino nitrogen
generated in the liver during process
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of gluconeogenesis?5) What are the sources of two
carbon atoms in urea molecule?
6) Why does ketoacidosis develop in
the patient?
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7) What happens to "branched chainamino acids" in the initial phase of
starvation?
8) What happens to alanine in the
initial phase of starvation?
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