Tuesday, January 8, 2008

5 - biochemistry mcqs - 31 to 40 - citric acid cycle

31 - for every NADH that passes its electrons on to the electron transport chain , approximately how many ATP are produced from the ADP and phosphate ?

answer is 3.

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32 - isocitrate lyase cleaves isocitrate to succinate and __________ in the glyoxylate pathway ?

answer is glyoxylate .

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33 - in a net reaction of the citric acid cycle , what are the reactants ?

answer is ---------- 3 NAD + plus FAD plus GDP plus PHOSPHATE plus acetyl co A .

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34 - which segment of the citric acid cycle is used in the glyoxylate pathway ?

answer is succinate to oxaloacetate .

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35 - gluconeogenesis takes place in the cytosol and the oxaloacetate must be converted for transport out of the mitochondrion .

the above statement is true .

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36 - which substrate in the citric acid cycle is coupled to the reduction of FAD to FADH2 ?

a- citrate
b- isocitrate
c- succinate
d- fumarate

answer is c .

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37 - which enzyme complex of e coli is a particle of about 4600 kD , with a diameter of 300 .

answer is pyruvate dehydrogenase .

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38 - when glucose is converted to lactate or ethanol , a relatively reduced product leaves the cell.

the above statement is true .

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39 - albert szent - gyorgyi found that cellular respiration is dramatically decreased by small amounts of succinate , fumarate , malate or oxaloacetate .

the above statement is false . the cellular respiration actually increases after adding these compounds .

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40 - the biosynthesis of which compounds uses the alpha ketoglutarate and oxaloacetate as starting materials ?

answer is amino acid biosynthesis .


TO VIEW THE CITRIC ACID CYCLE CLICK HERE

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