The reactions of pyruvate oxidation break: A. glucose into pyruvates B. pyruvate

Question

The reactions of pyruvate oxidation break: A. glucose into pyruvates B. pyruvates into glucose C. pyruvates into acetyl-CoA and carbon dioxide D. pyruvates into acetyl-CoA and water E. acetyl CoA into pyruvates and carbon dioxide Endergonic reactions: A. release energy B. involve the breaking of bonds C. can only occur if there is an input of energy the reactants D. have products with less potential energy than E. both A and Which statement(s) describe the currently accepted theory of how an enzyme and substrate together? A. as the product is released, the enzyme breaks down is like a lock B. the substrate is like a key that fits into the enzyme, which with the C. the active site is permanently changed by its interactions substrate enzyme, the shape of the active site D. as the substrate binds to the changes to accommodate the reaction E. both B and D The protective membranes covering the brain and spinal cord are: oblongata B, meninges C. reticular formation D. diencephalon E. both C and D Which process produced both NADH and FADH2? A, fermentation B. glycolysis C, the electron transport system D. the citric acid cycle E. pyruvate oxidation Which is NOT part of the cell theory? A. All living organisms are made up of cells B. All living organisms are C. Cells arise from preexisting cells D. Cell is the basic unit of life In a phospholipid bilayer, the: A. phosphate groups are hydrophobic B. fatty acid tails are ionized C. fatty acid tails are hydrophilic D. proteins are located only between the two layers E. none of these are true

Explanation / Answer

(34) The reaction of pyruvate oxidation break:

Pyruvate into acetyl co-a and carbon dioxide.

In this process pyruvate removes a carboxyl group which is released as carbon dioxide then the 2 carbon molecule from glucose is and NAD+ accepts 2 electron to form NADH the 2carbon molecule that is oxidized is an acetyl group gets attached to Coenzyme-A to form acetyl co-a.

(35) Endergonic reactions: (c) can only occur if there is an input of energy

Because Endergonic reactions require energy to do work For example in photosynthesis the light energy is absorbed and converted into chemical energy for production of food for plants so in such reactions energy is conserved hence these are Endergonic reactions.

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