Tag: amphibolic pathway

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Multiple choice biology respiration amphibolic pathway living organisms and energy production life processes in living organisms- part 1

An amphibolic pathway is

  1. TCA cycle

  2. Calvin cycle

  3. Terminal oxidation

  4. Electron transport chain
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Kreb's cycle consists of 8 cyclic steps which take place in the mitochondrial matrix. Each step is catalyzed by a specific enzyme. In Kreb's cycle, the entrant molecule is 2- carbon acetyl coenzyme A and the receptor molecule is 4- carbon oxaloacetate. Since the process involves both catabolic and anabolic reactions. it is an amphibolic pathway. It degrades acetyl coenzyme A and yields carbon dioxide and energy which is used to produce NADH, H+, and FADH+

Thus, the correct answer is option A. 

Multiple choice biology respiration amphibolic pathway living organisms and energy production life processes in living organisms- part 1

Mitochondria is the site for

  1. Krebs cycle

  2. Calvin cycle

  3. Anaerobic respiration

  4. Trapping of sun light
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • The citric acid cycle is also known as the TCA cycle (tricarboxylic acid cycle) or the Krebs cycle. 
  • It is a series of chemical reactions used by all aerobic organisms to release stored energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins, into adenosine triphosphate (ATP) and carbon dioxide.
  •  In eukaryotic cells, the citric acid cycle occurs in the matrix of the mitochondrion.
  •  In prokaryotic cells, such as bacteria, which lack mitochondria, the citric acid cycle reaction sequence is performed in the cytosol. 
  • Hence, Mitochondria is the site for the Krebs cycle.
  • So, the correct answer is 'Krebs cycle'.