___ 25- The Krebs cycle begins with the union of acetyl CoA with oxaloacetate fo
ID: 144588 • Letter: #
Question
___ 25- The Krebs cycle begins with the union of acetyl CoA with oxaloacetate forming citrate, allowing oxidative decarboxylation reactions to occur, and ends with the conversion of malate to oxaloacetate. Using this information and your knowledge of the Krebs cycle, how many net carbons does the citric acid cycle gain?
A) 0 carbons
B) 1 carbon
C) 2 carbons
D) 4 carbons
___ 26- Directly from the Krebs cycle we can obtain:
A) ATP
B) GTP and NADPH
C) ATP and NADPH
D) ATP, GTP, and NADPH
___ 27- Which of the following is not an intermediary of the Krebs cycle?
A) oxaloacetate
B) citrate
C) succinyl CoA
D) acetyl CoA
___ 28- How many di nucleotides are reduced by four turns of the Krebs cycle?
A) 1 FADH2 and 4 NADH
B) 2 FADH2 and 8 NADH
C) 4 FADH2 and 12 NADH
D) 1 FAD and 4 NAD +
Explanation / Answer
25) The answer is A (0 carbon).As in kreb cycle two carbon are lost as CO2 none of the carbon is gained.
26) The answer is D (ATP,GTP and NADH).At the end of kreb cycle 1FADH2 ,3NADH and 1 GTP or ATP is obtained.
27)The answer is D (acetyl Co A).As it is not the intermediate although it along with oxaloacetate forms citrate.
28) The answer is C (4 FADH2 and 12 NADH).As in one cycle 1 FADH2 and 3 NADH are formed.
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