Tag: fermentation

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

Fermentation refers to

  1. Anaerobic respiration

  2. Incomplete oxidation of carbohydrate

  3. Complete oxidation of carbohydrate

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

The process of respiration can be aerobic or anaerobic. The process of anaerobic respiration is also called fermentation. Fermentation is a form of anaerobic respiration in which carbohydrates are incompletely oxidised to either ethanol and carbon dioxide as in yeast or lactic acid as in the muscles of higher vertebrates.

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

Enzyme required to oxidise acetaldehyde is

  1. Ethanol oxidase

  2. Acetaldehyde dehydrogenase

  3. Alcohol hydrogenase

  4. Glyceraldehyde dehyadrogenase
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Acetaldehyde dehydrogenase enzyme oxidises acetaldehyde into acetate. This enzyme belongs to class of aldehyde dehydrogenases. Acetaldehyde is produced from the metabolism of alcohol by the enzyme alcoholic dehydrogenase. Acetaldehyde is toxic and its accumulation can lead to effects of hangover so it needs to be metabolized. It is converted into acetate by aldehyde dehydrogenase. Acetate is then converted into carbon dioxide and water. These metabolic reactions occur in liver.
So, the correct answer is 'Acetaldehyde dehydrogenase'.
Multiple choice biology life processes in living organisms- part 1 fermentation cell respiration living organisms and energy production

The anaerobic respiration is also called as.

  1. Fermentation

  2. Fragmentation

  3. Oxidation

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

Fermentation is an anaerobic process in which energy can be released from glucose even though oxygen is not available. Fermentation occurs in yeast cells, and a form of fermentation takes place in bacteria and in the muscle cells of animals. So, the correct answer is option A.

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

In Yeast, anaerobic respiration produces

  1. $CO _2$ and ethanol
  2. $CO _2$ and water
  3. $O _2$ and lactic acid
  4. $O _2$ and pyruvic acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yeast can undergo both aerobic respiration or anaerobic respiration. In anaerobic respiration, glucose is utilized and carbon dioxide and ethanol are formed. It is also called as alcoholic fermentation. In aerobic respiration, water and carbon dioxide are produced.

Thus, the correct answer is option A.

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

With reference to the products of microbial fermentation, which one of the following pairs is correctly matched?

  1. Lactic acid- Rhizopus stolonifer

  2. Vinegar- Acetobacter sp.
  3. Vitamin $B12$- Streptomyces griseus

  4. B-amylase- Saccharomyces sp.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Rhizopus stolonifer is a fungus known for producing lactic acid through fermentation. While other options have errors (e.g., Acetobacter produces acetic acid, not vinegar directly as a species name), this is the most accurate pairing provided.

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

Enzyme that changes glucose to ethyl alcohol is

  1. Zymase

  2. Diastase

  3. Invertase

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

A) Zymase causes the breakdown of sugars into alcohols.

B) Diastase catalyses the breakdown of starch into maltose.
C) Invertase is an enzyme that catalyses the breakdown of sucrose into fructose and glucose.
D) Maltase breaks down maltose to glucose.
So the correct answer is 'Zymase'

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

During lactic acid fermentation

  1. $O _2$ is used, $CO _2$ is liberated
  2. Neither $O _2$ is used nor $CO _2$ liberated
  3. $O _2$ is not used, $CO _2$ is liberated
  4. $O _2$ is used, $CO _2$ is not liberated
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In all organisms, during glycolysis, glucose is used as an energy source and converted into pyruvate, producing ATP and NADH molecules. Lactic acid fermentation is an anerobic metabolic process carried out by few bacteria (Lactobacillus) and animal (i.e., muscle) cells.  Lactate dehydrogenase (enzyme) participates in this process and converts the pyruvate (produced during glycolysis) to lactic acid, thereby regenerating NAD+, which can be returned to the cycle and helps to maintain glycolysis. 

So, the correct option is 'O2O2 is used, CO2CO2 is not liberated'.
CO2

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


Which process produces alcohol or lactate?

  1. Krebs cycle

  2. Glycolysis

  3. Electron transport system

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

Respiration is of two types :

Aerobic respiration- here oxygen is required for the process to occur. It occurs in the following three steps :
  • Glycolysis
  • Krebs cycle
  • Terminal oxidation
Anaerobic respiration- here oxygen is not required in the process of respiration. In this process, organic food is incompletely degraded without the use of oxygen which later produces ethanol or lactic acid as the end product.
So, the correct option is ' Fermentation'.