AP BIOLOGY

BIOCHEMISTRY

ENZYMES AND METABOLISM

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which process is the largest contributor to the release of CO2
A
Citric Acid Cycle or Krebs Cycle
B
Pyruvate Oxidation
C
Glycolysis
D
Oxidative Phosphorylation
Explanation: 

Detailed explanation-1: -Each citric acid cycle forms the following products: 2 molecules of CO2 are released. Removal of CO2 or decarboxylation of citric acid takes place at two places: In the conversion of isocitrate (6C) to -ketoglutarate (5C)

Detailed explanation-2: -The main human activity that emits CO2 is the combustion of fossil fuels (coal, natural gas, and oil) for energy and transportation. Certain industrial processes and land-use changes also emit CO2.

Detailed explanation-3: -Most of the carbon dioxide made during cellular respiration is produced during the citric acid cycle (also known as the Krebs cycle and the TCA cycle). The Krebs cycle is the second phase of cellular respiration.

Detailed explanation-4: -Krebs cycle produces the following: Two molecules of carbon dioxide are given off. One molecule of ATP is formed.

Detailed explanation-5: -While the Krebs cycle does produce carbon dioxide, this cycle does not produce significant chemical energy in the form of adenosine triphosphate (ATP) directly, and this reaction sequence does not require any oxygen.

There is 1 question to complete.