Which of the following is the best definition of the Krebs cycle?
a. the oxidation of pyruvic acid
b. the way cells produce CO₂
c. a series of chemical reactions in which NADH is produced from the oxidation of pyruvic acid
d. a method of producing ATP by phosphorylating ADP
e. a series of chemical reactions in which ATP is produced from the oxidation of pyruvic acid

Question

Which of the following is the best definition of the Krebs cycle?

a. the oxidation of pyruvic acid

b. the way cells produce CO₂

c. a series of chemical reactions in which NADH is produced from the oxidation of pyruvic acid

d. a method of producing ATP by phosphorylating ADP

e. a series of chemical reactions in which ATP is produced from the oxidation of pyruvic acid

Accepted Answer

Everyone. Let's take a look at this question together which of the following statements correctly describes the Creb cycle. And here we have three different statements where statement one says that the Creb cycle can freely utilize carbohydrates, lipids and amino acids to produce a TP statement. Two says the final step of the CREB cycle yields a TP. And statement three says that the CREB cycle starts with pyruvate from glycolysis. And we want to know whether answer choice a only statement, one is correct answer choice, B only statement two is correct answer choice, C only statement three is correct answer choice D statements. One and two are correct answer choice E statements two and three are correct or answer choice F statements. 12 and three are all correct. Let's work this problem out together to try to figure out which of the following statements correctly describes the Krebs cycle. So in order to solve this question, we have to recall what we have learned about the creb site to determine which of the following statements correctly describes the CREB cycle. And we can recall that the CREB cycle also known as the Citric acid cycle uses pyruvate, which is from glycolysis to generate a TP FA DH two as well as N A DH. And looking at our statements where statement one says that the creb cycle can freely utilize carbohydrates lipids and amino acids to produce a TP. We note that statement, one is a false statement as those carbohydrates lipids and amino acids must be converted into acetyl CO A in order to produce that a TP. So statement, one is not a correct statement which means we can eliminate answer choices, a answer choice D and answer choice. F next we have statement two which says that the final step of the crept cycle yields A TP, which we can also recall is a false statement. As the last step of the creb cycle does not yield a TP and instead it regenerates oxo acetate which is needed for the second turn of the creb cycle as the process of glycolysis produces two pyruvic acid molecules when it splits glucose. So statement two is also a false statement which means we can eliminate answer choice B and answer choice E which leaves us with only answer choice. See as the correct answer, which tells us that statement three correctly describes the creb cycle. Statement three says that the creb cycle starts with pyruvate from glycolysis, which is a true statement. So answer choice C is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.

Verified Solution

Key Concepts

Krebs Cycle Overview

Role of NADH

ATP Production