Press F11 to exit full screen QUESTION 7 Which enzyme catalyzes the first commit
ID: 134471 • Letter: P
Question
Press F11 to exit full screen QUESTION 7 Which enzyme catalyzes the first committed step in glycolysis? Phosphofructokinase 1 O Hexokinase Pyruvate Kinase O Aldolase QUESTION 8 Which of the following compounds are the products of the citric acid cycle? Check all that apply GTP ? NADH ? FADH2 CO2 Citrate QUESTION 9 Under aerobic conditions, pyruvate produced by glycolysis is converted to: O Acetyl-CoA O Lactate O Ethanol Alanine QUESTION 10 Which coenzyme, in the form shown below, can participate in an oxidation reaction i.e. accept electrons from another compound O NADPH O FMNHz O FAD O NADHExplanation / Answer
Q7:
Hexokinase catalyzes the first committed step in Glycolysis.
Glucose is converted to Glucose-6-phosphate using ATP as the phosphate donor, converting it to ADP.
Q8: Products of the Citric Acid cycle are GTP (1 molecule), NADH (3 molecules), FADH2 (1 molecule) and CO2 (2 molecules). The number of molecules mentioned here are those produced for every turn of the cycle, that is when a molecule of oxaloacetate reacts with a molecule of acetyl-CoA.
When Isocitrate is converted to alpha-ketoglutarate by the enzyme, NADH and CO2 are released.
Again when this alpha-ketoglutarate is converted to Succinyl CoA by the enzyme alpha-ketoglutarate dehydrogenase, NADH and CO2 are released.
This Succinyl CoA is converted to Succinate by the Succinyl-CoA synthetase releasing one GTP by using GDP and phosphate group.
Now, this Succinate is converted to Fumarate using Succinate dehydrogenase releasing one FADH2.
Malate to Oxaloacetate using Malate dehydrogenase releases one molecule of NADH.
Q9: Under aerobic conditions, pyruvate produced by Glycolysis is converted to Acetyl-CoA.
Pyruvate gets oxidized to Acetyl-CoA via an intermediary Acetataldehyde formation through decarboxylation. CoA binds to this forming acetyl-CoA or acetyl-Coenzyme A. This process s catalyzed by Pyruvate dehydrogenase complex, releasing one NADH and CO2.
Q10: Out of the 4 coenzymes mentioned, FAD acts as an electron acceptor.