Tuesday, January 8, 2008

11 - biochemistry mcqs - 76 to 86 - glycolysis

76 - an enzyme that transfers phosphoryl groups between ATP and a metabolite ?

a- kinase
b- aldolase
c- enolase
d- mutase

answer is a .


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77 - the ion essential for kinase activity ?

answer - magnesium .

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78 - the enzyme which catalyses the transfer of a functional group from one position to other ?

a- mutase
b- enolase
c- aldolase
d- kinase

answer is a . mutase . phosphoglycero mutase converts the 3 phosphoglycerate to 2 phosphoglycerate .


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79 - compounds with high phosphoryl group transfer potentials are formed during glycolysis .

the above statement is true .

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80 - when the need for ribose 5 phosphate exceeds that of NADPH , reversal of the transaldolase and transketolase reactions , diverts ribose 5 phosphate from the glycolytic pathway .

the above statement is true .

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81 - after phosphorylation , galactose reacts with the UDPG to form glucose 1 phosphate and ___________ before an epimerization reaction ?

answer is UDP - GALACTOSE

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82 - fructose metabolism in muscle requires only one step before it can enter into glycolysis ?

the above statement is true .

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83 - it has been demonstrated that triose phosphate isomerase has a reaction rate that is diffusion controlled and is therefore an example an enzyme that has reached catalytic perfection ?

the above statement is true .

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84 - enolase catalyses a reaction that results in the formation of a high energy intermediate .

the above statement is true . the enzyme enolase catalyses the conversion of the 2 - phosphoglycerate to phosphoenolpyruvate .

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85 - the statement which describes glycolysis stage II , the stage of energy recovery are ?

answer is --- two molecules of glyceraldehyde 3 phosphate are converted to pyruvate and four molecules of ATP are generated .

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86 - ribulose 5 phosphate is converted to xylulose 5 phosphate by the action of the enzyme ?

a- isomerase
b- epimerase
c- kinase
d- aldolase

answer is b .

TO READ COMPLETELY ABOUT GLYCOLYSIS CLICK HERE

TO KNOW MORE ABOUT HMP SHUNT CLICK HERE

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