caylagoudy
Answered

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Lactic acid fermentation can be modeled by which equation?
O Lactic acid + NADH → Pyruvic acid NADH
O Pyruvic acid + NAD+ → Lactic acid + NADH
O Lactic acid + NADH → Pyruvic acid + NAD+
O Pyruvic acid + NADH → Lactic acid + NAD+

Sagot :

samueladesida43

Lactic acid fermentation can be modeled by the following equation: Pyruvic acid + NADH → Lactic acid + NAD+

LACTIC ACID FERMENTATION:

  • Fermentation is a process undergone by some anaerobic organisms. Ideally, the process of cellular respiration proceeds as follows in the presence of oxygen: Glycolysis- Kreb cycle - ETC.

  • However, in the absence of oxygen (anaerobic condition), the product of glycolysis which is pyruvic acid combines with an electron carrier (NADH) to give rise to lactic acid and NAD+.

  • This means that pyruvic acid is reduced while NADH is oxidized as modelled in the following equation:

  • Pyruvic acid + NADH → Lactic acid + NAD+

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artasticdrawing

Answer to Question 1:

Well, given the choices to the question above 'Lactic acid fermentation can be modeled by which equation?', I would say that the best choice would be 'Pyruvic acid + NADH → Lactic acid + NAD+', or in other words, Option D.

Explanation for Question 1:

For a further explanation expanding more on the first question and showing why, the user above's answer is super helpful.

Answer to Question 2:

For the additional question asked 'In the Krebs cycle, how is citric acid formed?', I didn't see the options, however I believe they are:

O Carbon dioxide bonds with a chain of coenzyme A.

O Pyruvic acid molecules are broken down by an acetyl group.

O Acetyl-CoA joins with a large molecule called ozaloacetic acid.

O Enzymes combine hydrogen ions, oxygen, and electrons.

^ This being said, I would say your best choice would be Option C.

Explanation for Question 2:

The Krebs cycle begins when acetyl-CoA combines with a four-carbon molecule called OAA, aka oxaloacetate. This begins to produce citric acid, in which has six carbon-atoms. This is why the Krebs cycle is also referred to as 'the citric acid cycle.'

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