Tag: cell respiration

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Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

Choose the correct answers from the alternatives given :
In certain organisms and under certain conditions, which of the following can be used as an energy alternative to glucose

  1. fatty acids

  2. glycerol

  3. amino acids

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • in certain conditions such as starvation when sufficient amount of glucose is not present in the blood the foremost priority of the body is to provide brain with the sufficient amount of glucose.
  • So for the other body parts the energy that is to be provided can be done by the use of other substrates instead of glucose.
  • First alternative of glucose is fatty acid which is stored in the body. These fatty acid molecules are converted to acetyl coA by the process of beta oxidation and used in the kerbs cycle to provide the cell with energy.
  • Glycerol is also a fatty acid which is used as the other fatty acid in the kerbs cycle.
  • Amino acids are the part of protein molecules which are usually not stored in the body but can be used in the kerbs cycle whenever they are provided to the cell.
  • Therefore the answer 'all of these' is correct.
Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production

Production of alcohol by yeast fermentation is 

  1. Anaerobic

  2. Aerobic

  3. Light dependent

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

Yeast fermentation is a type of anaerobic respiration in which the substrate is oxidised in absence of oxygen. The intermediate product is acetaldehyde and final products are ethyl alcohol and CO$ _2$. It is also known as alcoholic fermentation. So the answer is 'Anaerobic'.

Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

What could be the reason for maida flour to increase in size?

  1. Fermentation

  2. Preservation

  3. Fumigation

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

Fermentation is an anaerobic process by which glucose is broken down into alcohol, carbon dioxide, hydrogen gas. Yeast is used during baking process. This process is responsible for the increasing the size of maida dough because yeast converts sugar into carbon dioxide and ethanol. Carbon dioxide gas is trapped by gluten proteins which causes dough to rise.

Thus, the correct answer is 'Fermentation.'

Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

Buchner was successful in extracting a respiratory enzyme complex

  1. ATP

  2. NADH

  3. Zymase

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

Eduard Buchner was a German chemist who won the Noble prize in chemistry for his chance discovery in 1907. His brother Hans Buchner was a physician who conducted early research on blood proteins that could destroy bacteria. Eduard Buchner assisted his brother in his research. He produced yeast cell-free extracts for his brother who wanted to use them for immunological applications. In order to preserve the protein extract from yeast cells, he added sugar and while doing this he noticed the formation of bubbles. This meant that carbon dioxide and alcohol were being produced. Buchner had obtained an enzyme mixture called zymase from yeast that caused glycolysis and transformed the sugar into alcohol. Thus he discovered zymase, a complex of the enzyme that caused glycolysis in 1903. 

Thus, the correct answer is option C. 

Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production
Dough kept overnight in warm weather becomes soft and spongy due to
  1. Absorption of ${CO} _{2}$ from atmosphere

  2. Imbibition

  3. Fermentation

  4. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Fermentation can be described as an enzyme-catalyzed process in which one substrate is usually broken down by the enzymes produced by bacteria, yeast, and other microorganisms. Fermentation of glucose results in the formation of ethanol and carbon monoxide. This is an exothermic reaction and results in the release of energy. The changes observed in dough after keeping it overnight in warm weather is an example of fermentation.
Thus, the correct answer is 'fermentation.'
Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

Which of the following is incorrect about fermentation?

  1. Toddy is made by fermenting sap from palms.

  2. Propionibacterium is used to ferment the cheese.
  3. The puffed-up appearance of dough is due to the production of ${ CO } _{ 2 }$.

  4. Fermentation in muscles produces alcohol.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A. Toddy is created by fermenting the saps of various species of palm trees such as the palmyra, date palms, and coconut palms.
B. Swiss cheese is obtained by propionic fermentation which occurs due to the propionibacteria.

C.  The yeast added to flour reproduces rapidly and produces carbon dioxide gas which gives a puffed-up appearance.
D. Fermentation in muscle cells produces a waste product called lactic acid which contributes to the fatigue in muscles.

So, the correct answer is 'Fermentation in muscles produces alcohol'.

Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production

In respiratory process which step is not related with decarboxylation?

  1. Alcoholic fermentation

  2. TCA cycle

  3. Oxidative decarboxylation of Pyruvate

  4. Lactic acid fermentation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
 Name of process   Decarboxylation occurence
 Alcoholic fermentation  Pyruvate (3C) $\rightarrow$  Acetaldehyde (2C)
 TCA cycle  Isocitrate$\rightarrow$ $\alpha$ ketoglutarate
 Oxidative decarboxylation Pyruvate $\rightarrow$ Acetyl CoA
 Lactic acid fermentation  No decarboxylation process occurs

So, the correct answer is ' Lactic acid fermentation '.