AP BIOLOGY

Detailed explanation-1: -The second stage of cellular respiration is the transfer of the energy in pyruvate, which is the energy initially in glucose, into two energy carriers, NADH and FADH2. A small amount of ATP is also made during this process. This process occurs in a continuous cycle, named after its discover, Hans Krebs.

Detailed explanation-2: -Second Step of the Krebs Cycle: Aconitase In the second reaction of the Krebs cycle, the isomerisation of citrate to isocitrate takes place. As an intermediate, cis-aconitate is formed. Therefore, it is a two-step reaction sequence. In the first step, H2O is removed from the cireate molecule (see Figure).

Detailed explanation-3: -The second stage of cellular respiration, called the Krebs cycle, takes place in the matrix of a mitochondrion.

Detailed explanation-4: -This cycle involves a series of reactions involving a (1) a substrate, Oxaloacetate, that is modified in every reaction, (2) Acetyl–CoA, from which energy is extracted, (3) energy transport reactants, which collect the extracted energy, and (4) the controlling enzymes, which regulate the steps of the cycle.