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A teenager concerned about his weight attempts to maintain a fat-free diet for a
period of several weeks. If his ability to synthesize various lipids were examined, he
would be found to be most deficient in his ability to synthesize
A) Triacylglycerol B) Phospholipids
C) Cholesterol D) Prostaglandins

AtRNA molecule that is supposed to carry cysteine (tRNA‘YS) is mischarged, so that
it actually carries alanine (ala-tRNA‘YS). What will be the fate of this alanine residue
during protein synthesis ?
A) It will be incorporated into a protein in response to an alanine codon

B) It will be incorporated into a protein in response to a cysteine codon

C) It will remain attached to the tRNA, as it cannot be used for protein synthesis
D) It will be chemically converted to cysteine by cellular enzymes

Which of the sequence of formation of initiation complex during translation with the
help of initiation factors ?

A) 30S - mRNA ‏ج‎ f-Met-tRNA; ೨ 505 8) 50S - mRNA ‏ج‎ f-Met-tRNA; > 30S
©) 50S ‏ج‎ f-Met-tRNA; ಎ mRNA > 30S 0) 305 ‏ج‎ f-Met-tRNA,; ಎ mRNA 505

How many DNA duplexes are obtained from one DNA duplex after 4 cycles of PCR ?
A) 8 B) 4 C) 32 D) 16

In hemolytic jaundice Vandenberg reaction is
A) Indirect positive 8) Direct positive ©) Biphasic D) None of these

The following is the sum of three steps in the citric acid cycle
A+B+FAD +H,0 ‏جل‎ © + FADH, + NADH

Reactant A Reactant B Reactant C
A) Succinyl CoA GDP Succinate
B) Succinate NAD+ Oxaloacetate
C) Fumarate NAD+ Oxaloacetate
D) Succinate NAD+ Malate

Which one of the following statements concerning the binding of oxygen by haemoglobin

is correct ?

A) The Bohr effect results in a lower affinity for oxygen at higher pH values

B) Carbon dioxide increases the oxygen affinity of haemoglobin by binding to the
amino terminal groups of the polypeptide chains

C) The oxygen affinity of haemoglobin increases as the percent saturation
increases

D) The haemoglobin tetramer binds four molecules of 2, 3-BPG

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