What does the product of glycolysis become before it enters the Krebs cycle: a)

Question

What does the product of glycolysis become before it enters the Krebs cycle: a) CO_2 b) citric acid c) acetyl-CoA d) H_2 O e) pyruvic acid What does the molecule in previous question become a part of immediately after entering the Krebs cycle: a) CO_2 b) citric acid (citrate) c) acetyl-CoA d) H_2 O e) pyruvic acid Where does electron transport occur in eukaryotic cells: a) across the mitochondrial inner membrane b) across the mitochondrial outer membrane c) mitochondrial matrix d) mitochondrial intramembrane space e) cytoplasm Where do the reactions of glycolysis occur: a) mitochondria inner membrane b) across the mitochondrial outer membrane c) mitochondrial matrix d) mitochondrial intramembrane space e) cytoplasm Where does ATP production (phosphorylation of ADP) occur during aerobic respiration in eukaryotic cells: a) across mitochondria inner membrane & matrix b) across the mitochondrial outer membrane & cytoplasm c) mitochondrial matrix & outer membr

Explanation / Answer

Ans 28) The product of glycolysis is Pyruvic acid whch is converted to Acetyl co-A by Pyruvate dehydrogenase complex. So, the product before entering the Kreb cycle is "Acetyl co-A"

Ans 29) After entering into the Kreb cycle, the acteyl co-A react with "Oxaloacetic acid " to form " Citrate" by the enzyme Citrate Synthase.

Ans 30) In eukaryotes the Electron Transport chain occur in "Mitochondrial Matrix"

Ans 31) Both in Eukaryotes and Prokaryotes, the reactions of glycolysis occur in "Cytoplasm".

Ans 32) ATP production occur during aerobc respiration in the the mitocondria and takes place the " across mitocondrial inner membrane and mitocondrial matrix." ATP production occur by the activity of ATP synthase enzyme.

Ans 33) ATP production occur in mitocondria by the process of "both substrate level and oxidative phosphorylation." This is because respiration means formation of CO2 and in Kreb Cycle CO2 is produced and 1 GTP is produced as "Substrate level phosphorylation". Moreover the NADH+ + H+, FADH2 which are formed during Kreb cycle is replenished at Electron Transport Chain to form ATP by the enzyme ATP synthase otherwise the Kreb cyle would stop due less availability of Cofactors.. The terminal hydrogen acceptor of these cofactors i.e. NADH+ + H+ and FADH2 is oxygen. Thus the entire respiration of Kreb cycle and Electron Transport Chain occur by following this mechanism pathway.

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