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2021-05-16

What is the second phase of glycolysis called?

What is the second phase of glycolysis called?

The second half of glycolysis is known as the pay-off phase, characterised by a net gain of the energy-rich molecules ATP and NADH. Since glucose leads to two triose sugars in the preparatory phase, each reaction in the pay-off phase occurs twice per glucose molecule.

Why is glycolysis described as having an energy investment phase and energy payoff phase?

Why is glycolysis described as having an investment phase and a payoff phase? It uses stored ATP and then forms a net increase in ATP. In the presence of oxygen, the three-carbon compound pyruvate can be catabolized in the citric acid cycle.

What happens during the second part of glycolysis?

The second half of glycolysis extracts ATP and high-energy electrons from hydrogen atoms and attaches them to NAD+. Two ATP molecules are invested in the first half and four ATP molecules are formed by substrate phosphorylation during the second half.

Why is the energy investment stage of glycolysis called as such?

This phase is known as the energy-requiring phase or the energy investment phase because energy in the form of ATP is needed in order to form the unstable fructose molecule from glucose.

Is NADH oxidized in fermentation?

In the process of fermentation the NADH + H+ from glycolysis will be recycled back to NAD+ so that glycolysis can continue. If NAD+ is not present, glycolysis will not be able to continue. During aerobic respiration, the NADH formed in glycolysis will be oxidized to reform NAD+ for use in glycolysis again.

What happens Chemiosmosis?

Chemiosmosis involves the pumping of protons through special channels in the membranes of mitochondria from the inner to the outer compartment. The pumping establishes a proton (H+) gradient. After the gradient is established, protons diffuse down the gradient through a transport protein called ATP synthase.

Where does the Chemiosmosis occur?

mitochondria