Tag: life processes in living organisms- part 1

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Questions Related to life processes in living organisms- part 1

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

Which of the two statements together support that respiratory pathway is an amphibolic pathway.
i) Fats breakdown to glycerol and fatty acids, subsequently yields acetyl CoA
ii) In respiration C-C bonds of complex compounds breakdown through oxidation leading to release of energy
iii) Acetyl CoA from respiratory pathway is withdrawn for synthesis of fatty acids
iv) Proteins are degraded by protease to amino acids and enter the respiratory pathway

  1. i, ii

  2. i, iv

  3. ii, iv

  4. ii, iii
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Statement ii describes the catabolic nature (breakdown of C-C bonds), while statement iii describes the anabolic nature (withdrawal of intermediates like Acetyl CoA for fatty acid synthesis), together defining the amphibolic pathway.

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

Largest amount of phosphate bound energy is produced in the process of respiration during 

  1. Anaerobic respiration

  2. Glycolysis

  3. Krebs cycle

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During the process of glycolysis 8 ATP molecules are produced in aerobic respiration. In the case of Krebs cycle 30 ATP molecules can be produced.

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

The process by which the energy of glucose is released under aerobic respiration was discovered by

  1. Hopkins

  2. Lister

  3. Krebs

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

The process by which the energy of glucose is released under aerobic respiration, was discovered by Hans Krebs. The Krebs cycle is a part of cellular respiration. It is a series of chemical reactions used by all aerobic organisms to generate energy.

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

Aerobic respiratory pathway is appropriately called as

  1. Anabolic

  2. Catbolic

  3. Amphibolic

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

Aerobic respiratory pathway is appropriately called amphibolic pathway. It contains both catabolic and anabolic reactions. The pathway is catabolic because in this pathway, glucose is broken down into carbon dioxide and water. It is also anabolic pathway as energy rich ATP molecule is produced during this pathway. These ATP molecules are later used to carry out various reaction. 

Thus, the correct answer is option C.

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

Kerbs cycle __________________.

  1. Liberates a minor part of energy during respiration

  2. Is operative in photorespiration

  3. Reactions are independent of oxygen supply

  4. Is a like between carbohydrate and nitrogen metabolism
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Krebs cycle is a major metabolic pathway that releases energy in the form of NADH, FADH2, and ATP/GTP. While it is a central hub, it is primarily responsible for the oxidation of acetyl-CoA.

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

In Kreb's cycle, OAA accepts acetyl CoA to form 

  1. Citric acid

  2. Oxalosuccinate

  3. Fumarate

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

The citric acid cycle starts with the condensation of acetyl group with oxalo acetic acid and water to yield citric acid. The reaction is catalysed by the enzyme citrate synthase and a molecule of CoA is released.

Image result for citric acid cycle
So the correct option is 'citric acid'.

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.