Tag: respiration in cell

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Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

The net gain of ATP from one molecule of glucose in aerobic respiration is

  1. 18 ATP

  2. 38 ATP

  3. 60 ATP

  4. 80 ATP
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If the food substances in living cells are oxidized in presence of oxygen, it is called aerobic respiration. It is the step-wise complete breakdown of the respiratory substrates like glucose into simpler molecules like $CO _2$ and water with the release of ATP. It is mostly seen in eukaryotic type of organisms. Each glucose molecule on complete oxidation gives 38 ATP molecules. 

Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

How many PGAL are produced by glycolysis of 3 molecules of glucose? How many ATP are released by respiration of these PGAL till formation of $O _2$ and $H _2O$?

  1. 4 PGAL-80 ATP

  2. 6 PGAL-160 ATP

  3. 4 PGAL40 ATP

  4. 6 PGAL-120 ATP
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Glycolysis of one molecule of glucose produces 2 PGAL, thus of three molecules will produce 6 PGAL.
Respiration of one molecule of glucose or 2 PGAL produces 38 ATP molecules, thus, of 6 PGAL will produce 114 ATP molecules. Out of the given options 120 ATP is the nearest correct answer. Thus the correct answer is option D.

Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

Which of the following is not an electron transferring molecule?

  1. ATP
  2. NAD$^{+}$

  3. Fe-S protein

  4. Co-enzyme Q
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Adenosine triphosphate is a nucleoside triphosphate used in cells as a coenzyme. It is often called the molecular unit of currency of intracellular energy transfer. ATP transports chemical energy within cells for metabolism. It is one of the end products of photophosphorylation, cellular respiration and fermentation and used by enzymes and structural proteins in many cellular processes, including biosynthetic reactions, motility and cell division. One molecule of ATP contains three phosphate groups.

Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP -

  1. Glycolysis

  2. Krebs cycle

  3. Electron transport chain

  4. Conversion of pyruvic acid to acetyl CoA
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In glycolysis 4 ATP and 2NADH2 molecules are formed. These 2NADH2  molecules go to electron transport chain. In oxidative decarboxylation no ATP molecule is formed but two molecules of 2NADH2  are formed from two molecules of pyruvate. These two NADH2 go to electron transport chain. In Kreb's cycle 2 ATP, 6NADH2 and 2FADH2 molecules are formed from two molecule of acetyl Co-A. These NADH2 and 2FADH2  go to electron transport chain. In electron transport chain all 2NADH2   and 2FADH2  pass to electron carriers and yield 3 ATP and 2 ATP molecules per 2NADH2   and 2FADH2  respectively. Thus,  4 ATP are formed in glycolysis, 2 ATP in Krebs cycle and 34 ATP from electron transport chain. 40 ATP and 2 ATP molecules are used during glycolysis. So, net gain of ATP molecules during one complete oxidation of a glucose molecule is 38 ATP.


So, the correct answer is 'Electron transport chain'.

Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

Out of $38$ ATP molecule how many ATP are formed by substrate level phosphorylation by aerobic respiration of $1$ glucose?

  1. $2$
  2. $3$
  3. $4$

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

Substrate level phosphorylation involves the conversion of 1,3 bisphosphoglycerate to 3 phosphoglycerate producing ATP.

For 1 molecule of glucose, 2 (1,3 bisphosphoglycerate) are formed, hence 2 ATP are formed.  

Multiple choice bio-chemistry carbohydrate metabolism energy output living organisms and energy production respiration in cell

Number of ATP molecules formed during aerobic respiration in break down of one glucose molecule via malate aspartate shuttle is 

  1. 38

  2. 18

  3. 28

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

In aerobic respiration, the malate-aspartate shuttle is more efficient than the glycerol-3-phosphate shuttle. It results in the production of 38 ATP molecules per glucose molecule in prokaryotes or specific eukaryotic tissues.