Tag: anaerobic respiration in organisms

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Multiple choice biology the respiratory system anaerobic respiration in organisms anaerobic and aerobic respiration cellular respiration

The respiration carried in the absence of oxygen is called

  1. Aerobic respiration

  2. Anaerobic respiration

  3. Mastication

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

  • In anaerobic respiration, glucose breaks down without oxygen.
  •  The chemical reaction transfers energy from glucose to the cell.
  •  Anaerobic respiration produces lactic acid, rather than carbon dioxide and water. Hence, The respiration carried in the absence of oxygen is called anaerobic respiration.
So, the correct answer is 'anaerobic respiration'.

Multiple choice biology the respiratory system anaerobic respiration in organisms anaerobic and aerobic respiration cellular respiration

In anaerobic respiration

  1. O$ _{ 2 }$ is taken in.
  2. CO$ _{ 2 }$ is taken in.
  3. O$ _{ 2 }$ is given out.
  4. CO$ _{ 2 }$ is given out.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Anaerobic respiration is a type of respiration that does not use oxygen. It is used when there is not enough oxygen for aerobic respiration. 
Anaerobic respiration in some microorganisms (such as yeast) produces ethanol and carbon dioxide, as opposed to lactic acid.

So, the correct answer is option D.

Multiple choice biology the respiratory system anaerobic respiration in organisms anaerobic and aerobic respiration cellular respiration

Which of the following will survive in a closed container and perform fermentation?

  1. Algae

  2. Yeast

  3. Virus

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

  • Yeasts are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom.
  •  Yeast is a microorganism that can undergo aerobic as well as anaerobic respiration. 
  • Yeast requires oxygen for growth. In addition to oxygen, they require a basic substrate such as sugar. 
When yeast cells are kept in an anaerobic environment (i.e., without oxygen)can ferment sugars to alcohol and carbon dioxide. They produce ethyl alcohol and carbon dioxide from simple sugars such as glucose and fructose. Hence, the yeast can survive in a closed container and perform fermentation.
So, the correct answer is 'yeast'.

Multiple choice biology the respiratory system anaerobic respiration in organisms anaerobic and aerobic respiration cellular respiration

The organisms that undergo anaerobic respiration to make alcohol are

  1. Bacteria

  2. Yeast

  3. Algae

  4. Protozoa
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Yeast can undergo both aerobic and anaerobic respiration. Anaerobic respiration occurs in yeast in the absence of oxygen. It is also known as fermentation. The products of anaerobic respiration in yeast are carbon dioxide, alcohol and 2 molecules of ATP.
So the correct answer is 'Yeast'.
Multiple choice biology the respiratory system anaerobic respiration in organisms anaerobic and aerobic respiration cellular respiration

ATP is stored on the myosin cross bridges for immediate energy After 5 to 6 seconds, this supply is exhausted and the muscle must rely on to quickly produce more ATP.

  1. Phosphocreatine

  2. Lactic acid

  3. Acetyl choline

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

  • Myofibril activity is required for muscle contraction on the molecular level. 
  • When ATP binds to myosin, it separates from the actin of the myofibril, which causes a contraction.
  • The muscle contraction cycle is triggered by calcium ions binding to the protein complex troponin, exposing the active-binding sites on the actin.
  • ATP then binds to myosin, moving the myosin to its high-energy state, releasing the myosin head from the actin active site.
  • When ATP is exhausted lactic acid is produced 
So, the correct option is 'lactic acid'.

Multiple choice respiration-the energy producing system anaerobic respiration in organisms anaerobic and aerobic respiration cellular respiration

Glycolysis yields approximately ___ percent of the total energy of glucose.

  1. 5%

  2. 10%

  3. 15%

  4. 2%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Glycolysis is the initial stage of glucose breakdown, occurring in the cytoplasm. It yields a small amount of energy compared to the complete oxidation of glucose in the Krebs cycle and electron transport chain, accounting for approximately 5% of the total energy.

Multiple choice respiration-the energy producing system anaerobic respiration in organisms anaerobic and aerobic respiration cellular respiration

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

  1. 4 PGAL 40 ATP

  2. 6 PGAL 120 ATP

  3. 4 PGAL 80 ATP

  4. 5 PGAL 160 ATP
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

One glucose molecule produces 2 PGAL (G3P) during glycolysis. Therefore, 3 glucose molecules produce 6 PGAL. The complete respiration of 6 PGAL (via Krebs cycle and ETC) yields 120 ATP (since 1 glucose yields 38 or 36 ATP, and 3 glucose yields roughly 114-120 ATP).

Multiple choice respiration-the energy producing system anaerobic respiration in organisms anaerobic and aerobic respiration cellular respiration

State whether the following statements are true or false.
Obligate anaerobes are killed by molecular oxygen.

  1. True

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

Obligate means restricted to the particular environment so the anaerobes that grow and multiply in the absence of molecular oxygen and are not able to survive in the presence of oxygen.

So, the correct option is 'True'.