54- in glycolysis ?
ans- glucose is converted inot 2 molecules of pyruvate by the synthesis of two NADH and 2 ATP molecules and utilisation of 2ATP molecules too .
- i dont wanna give u choices in this question because it confuses u a lot , so stick to the above statement .
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55 - the compound which reduces the affinity of pyruvate kinase for its substrate ?
a- phosphoenol pyruvate
b- pyruvate
c- NADH
d- ATP
answer is ATP .
The pyruvate kinase converts phosphoenol pyruvate to pyruvate and in this reaction ATP is synthesized .
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56 - in muscle , glycolytic flux is subject to regulation by substrate cycling .
the above statement is true .
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57 - a deficiency of type B aldolase , results in __________ intolerance , a self limiting genetic disease ?
a- fructose intolerance
b- glucose intolerance
c- galactose intolerance
d- ribose intolerance
the answer is a .
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58 - the isomerisation of glucose-6-phosphate to fructose-6-phosphate is catalysed by which enzyme ?
a- hexokinase
b- glucokinase
c- phosphoglucose isomerase
d- phosphofructo kinase
answer is c . phosphoglucose isomerase.
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59 - the glyceraldehyde 3 phosphate dehydrogenase reaction is exergonic and will therefore proceed in the forward direction ?
the above statement is false . the glyceraldehyde 3 phosphate dehydrogenase reaction is slightly endergonic , but is pulled forward by the subsequent reaction of phosphoglycerate kinase . phosphoglycerate kinase converts 1 , 3 bisphosphoglycerate to 3 phosphoglycerate .
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60 - the rate of NADPH production is controlled by the rate of glucose-6-phosphate dehydrogenase reaction .
the above statement is true .
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61 - the exclusion of water from the active site of hexokinase is responsible for preventing the hydrolysis of ATP from being the dominant reaction during catalysis .
the above statement is true .
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62 - phosphoglycerate kinase catalyses a step in glycolysis , which results in the formation of ATP .
the above statement is true . the enzyme phosphoglycerate kinase catalyses the conversion of 1 , 3 bisphosphoglycerate to 3 phosphoglycerate to produce one ATP .
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63 - The hexokinase has very low affinity for hexoses .
the statement is true .
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64 - in two steps mannose is converted to ______, to enter into the glycolytic pathway ?
a- fructose 6 phosphate
b- glucose 6 phosphate
c- fructose
d- glucose
answer is a .
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