98 - Thiamine pyrophosphate , functions as an ________ sink that acts to stabilize the carbon ion adduct formed during the decarboxylation of pyruvate .
answer is electron sink .
----------------------------------------------------------------------
99 - phosphoglycerate kinase converts 1 , 3 bisphosphoglycerate to 3 phosphoglycerate and forms an ATP .
------------------------------------------------------------------------
100 - the irreversible rate determining step in glycolysis is catalysed by ?
answer is PFK .
----------------------------------------------------------------------------
101 - pentose phosphate pathway is also called hexose monophosphate shunt .
--------------------------------------------------------------------------
102 - the molecule which conserves the free energy of metabolite oxidation for ATP synthesis ?
NADH .
------------------------------------------------------------------------
103 - The molecule which conserves the free energy of metabolite oxidation for reductive biosynthesis ?
NADPH .
----------------------------------------------------------------------
104 - 6 phosphogluconolactonase ------- 6 - phosphogluconate
6 phosphogluconate dehydrogenase ------------ RU5P
glucose 6 phosphate dehdrogenase -------- first committed step in HMP pathway
---------------------------------------------------------------------------------
105 - The process of fermentation has greater thermodynamic efficacy under physiological conditions than under standard biochemical conditions ?
the above statement is true .
--------------------------------------------------------------------------------
106 - under aerobic conditions glucose is oxidised during glycolysis and the coenzyme _________ is reduced and subsequently oxidised in a process known as electron transport ?
NAD +
-------------------------------------------------------------------------------------
107 - in muscle a 10 % decrease in ATP concentration , results in a 100 % increase in ADP concentration and 400 % increase in AMP concentration .
true .
TO READ COMPLETELY ABOUT GLYCOLYSIS CLICK HERE
TO KNOW MORE ABOUT HMP SHUNT CLICK HERE
----------------------------------------------------------------------------
Tuesday, January 8, 2008
12 - biochemistry mcqs - 87 to 97 - glycolysis
87 - lactose build up in the muscle during vigorous activity causes muscle fatigue and soreness .
the above statement is false . it is glycolytically generated acid that causes muscle fatigue and soreness .
----------------------------------------------------------------------------
88 - when NADPH is needed from the pentose phosphate pathway , excess ________ is converted to glycolytic intermediates by a sequence of reactions which can operate in reverse .
ribulose - 5 - phosphate .
--------------------------------------------------------------------------
89 - which state of PFK , does AMP preferentially bind ?
a- to the R state
b- to the T state
c- to both states without any preference
d- to neither
answer is a . to the R state .
-----------------------------------------------------------------------------------
90 - yeast alcohol dehydrogenase and mammalian liver alcohol dehydrogenase , both require ____
a- Mg + 2
b- Zn + 2
c- calcium
d- iron
answer is b . ZINC .
-----------------------------------------------------------------------------------
91 - glyceraldehyde 3 phosphate is phosphorylated to produce 1 , 3 bisphosphoglycerate to produce one molecule of NADH in the presence of the enzyme GA3P dehydrogenase .
-------------------------------------------------------------------------------
92 - alcoholic fermentation results in the regenration of NAD + along with the conversion of pyruvate to _______ and CO2 .
answer is ethanol.
-----------------------------------------------------------------------------------
93 - the deficiency of which vitamine results in a condition called beri beri ?
thiamine is the answer .
----------------------------------------------------------------------------
94 - transketolase has a thiamine pyrophosphate cofactor and catalyses the transfer of a c2 unit from XU5P to R5P .
true .
-----------------------------------------------------------------------------------------
95 - the three products of glycolysis are ATP , NADH and pyruvate .
---------------------------------------------------------------------------------------
96 - what does ATP do to PFK , at high concentrations?
- it acts as an allosteric inhibitor , by binding to the T state .
---------------------------------------------------------------------------------------
97 - the level of available ______, regulates hemoglobin's oxygen affinity ?
answer is 2 ,3 BPG.
TO READ COMPLETELY ABOUT GLYCOLYSIS CLICK HERE
TO KNOW MORE ABOUT HMP SHUNT CLICK HERE
--------------------------------------------------------------------------------
the above statement is false . it is glycolytically generated acid that causes muscle fatigue and soreness .
----------------------------------------------------------------------------
88 - when NADPH is needed from the pentose phosphate pathway , excess ________ is converted to glycolytic intermediates by a sequence of reactions which can operate in reverse .
ribulose - 5 - phosphate .
--------------------------------------------------------------------------
89 - which state of PFK , does AMP preferentially bind ?
a- to the R state
b- to the T state
c- to both states without any preference
d- to neither
answer is a . to the R state .
-----------------------------------------------------------------------------------
90 - yeast alcohol dehydrogenase and mammalian liver alcohol dehydrogenase , both require ____
a- Mg + 2
b- Zn + 2
c- calcium
d- iron
answer is b . ZINC .
-----------------------------------------------------------------------------------
91 - glyceraldehyde 3 phosphate is phosphorylated to produce 1 , 3 bisphosphoglycerate to produce one molecule of NADH in the presence of the enzyme GA3P dehydrogenase .
-------------------------------------------------------------------------------
92 - alcoholic fermentation results in the regenration of NAD + along with the conversion of pyruvate to _______ and CO2 .
answer is ethanol.
-----------------------------------------------------------------------------------
93 - the deficiency of which vitamine results in a condition called beri beri ?
thiamine is the answer .
----------------------------------------------------------------------------
94 - transketolase has a thiamine pyrophosphate cofactor and catalyses the transfer of a c2 unit from XU5P to R5P .
true .
-----------------------------------------------------------------------------------------
95 - the three products of glycolysis are ATP , NADH and pyruvate .
---------------------------------------------------------------------------------------
96 - what does ATP do to PFK , at high concentrations?
- it acts as an allosteric inhibitor , by binding to the T state .
---------------------------------------------------------------------------------------
97 - the level of available ______, regulates hemoglobin's oxygen affinity ?
answer is 2 ,3 BPG.
TO READ COMPLETELY ABOUT GLYCOLYSIS CLICK HERE
TO KNOW MORE ABOUT HMP SHUNT CLICK HERE
--------------------------------------------------------------------------------
Subscribe to:
Posts (Atom)
Subscribe Now: Feed
You are visitor number
