Tag: amphibolic pathway

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

In Kreb's cycle formation of ___________________.

  1. $34$ ATP takes place
  2. $38$ ATP takes place
  3. $15$ ATP from each acetyl Co-A takes place
  4. $12$ ATP from each acetyl Co-A takes place $(24\ ATP)$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In the Krebs cycle, each acetyl CoA oxidation yields 3 NADH, 1 FADH2, and 1 GTP (equivalent to 1 ATP), which collectively generate 12 ATP molecules through oxidative phosphorylation in older traditional calculations often referenced in textbooks. Thus, the formation of 12 ATP from each acetyl CoA is the standard representation for this pathway.

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

How many oxidation step take place during glycolysis, link reaction and Kreb's cycle.

  1. $1, 1 and 1$
  2. $1, 1 and 4$
  3. $1, 1 and 3$
  4. $1, 1 and 8$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Glycolysis has 1 oxidation step (G3P to 1,3-BPG), the link reaction has 1 (pyruvate to acetyl-CoA), and the Krebs cycle has 4 (isocitrate to alpha-ketoglutarate, alpha-ketoglutarate to succinyl-CoA, succinate to fumarate, and malate to oxaloacetate).

Multiple choice biology respiration in plants amphibolic pathway living organisms and energy production life processes in living organisms- part 1
Respiratory Pathway is _______.

  1. Catabolic

  2. Amphibolic

  3. Anabolic

  4. Endergonic
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The same respiratory process which acts as a catabolic pathway for respiratory substrates also acts as an anabolic pathway for the synthesis of various intermediary metabolic products and secondary metabolites. The respiratory pathway, therefore, acts both as catabolic as well as an anabolic pathway. Thus, it is better to call it the amphibolic pathway rather than a catabolic pathway alone.

So the correct option is B.

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

During amphibolic pathway, acetyl Co-A can perform the biosynthesis of 

  1. Amino acid

  2. Gibberellic acid

  3. Fatty acid

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fatty acid synthesis takes place in the cytoplasm of the cell. It is the creation of fatty acids from acetyl-CoA and NADPH through the action of enzymes called fatty acid synthases. Most of the acetyl-CoA which is converted into fatty acids is derived from carbohydrates via the glycolytic pathway. 

So, the correct option is 'Fatty acid'.

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

Find the incorrect match (with respect to ATP gain) -

  1. Bacterial cell - $38$ ATP or $2$ ATp
  2. Citric Acid Cycle - $12$ ATP
  3. Nerve cell - $38$ ATP
  4. Liver cell - $38$ ATP
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Kreb’s Cycle gives 3 moles of NADH, 1 mole of FADH and 1 mole of ATP per cycle of substrate i.e per 1 mole of Acetyl CoA. However net ATP i.e after ETS which would make the answer to 12 ATP(9+2+1) respectively.

36 ATPs are produced in Aerobic Respiration involving the complete breakdown of glucose molecule into carbon-dioxide and water using oxygen as final electron aceptor

Complete oxidation of glucose molecule takes place in 3 sequential reactions -

1.Glycolysis occuring in cytoplasm

2.Kreb cycle occuring in mitochondrial matrix

3 Electron transport chain (ETC )and oxidative phosphorylation occuring in inner mitochondrial membrane . So,total number of ATPs produced in aerobic respiration are

Glycolysis - 6/8 ATPs

Link reaction and kreb cycle - 30ATPs

Total -36/38 ATPs.


So, the correct option is 'Option A'.

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

Mechanism of aerobic respiration was discovered by

  1. Kreb

  2. Calvin

  3. Hatch and Slack

  4. Pasteur
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mechanism of aerobic respiration was given by Kreb. Thus it was named as Krebs cycle. Aerobic respiration is the respiration, which involves the breakdown of the substrate in the presence of oxygen (oxidation process).

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

Which one of the following reactions is an example of oxidative decarboxylation?

  1. Conversion of succinate to fumarate.

  2. Conversion of fumarate to malate.

  3. Conversion of pyruvate to acetyl Co-A.

  4. Conversion of citrate to isocitrate.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The conversion of pyruvate to acetyl-CoA is a linker step between glycolysis and Krebs cycle. After the entry of pyruvate in the mitochondria the acetylation takes place in the perimitochondrial space which is the space between the inner and outer mitochondrial membrane. Each molecule of pyruvic acid is oxidatively decarboxylated to acetyl coA by the action of an enzyme complex pyruvate dehydrogenase. The acetyl coA then enters the Krebs cycle.  Thus the correct answer is option C.

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

The importance of the Kreb's cycle is 

  1. Production of amino acid

  2. Production of vitamin

  3. Production of ATP molecule through oxidative phosphorylation

  4. ATP formation through oxidative and substrate level phosphorylation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pyruvic acid enters Krebs cycle in form of acetyl CoA where it is oxidatively decarboxylated into CO$ _2$. The complete Kreb cycle leads to the net formation of 2 molecules of ATP by substrate-level phosphorylation, 8 molecules of NADH plus 2 molecules of FADH$ _2$ (via succinate dehydrogenase). The NADH and FADH$ _2$ then enter the ETS to drive ATP production by substrate level phosphorylation. 

So, the correct answer is option D.